Youtube all the way for me.  It's completely free, no limit on how much you can put up and you can monetize your tracks (even covers).  Of course, with the amount of content on Youtube it's easy to get lost in the shuffle.  But it's the highest potential audience at the same time.

Youtube and Soundcloud are the two places where I post my music. They're both available for free and they seem to be the two places where a lot of music gets listened to/discovered.

I have been in this hunt for the last few days. I really like soundcloud but my account is a bit messed up and I have not received any email support as of yet to fix it. They do not have phone support. It is free and the free account will serve most peoples needs. They have two pro plans, one at $55 per year and one at around $140 a year. I don't mind paying the $140 a year but I am not happy with the lack of support when issues happen.
 
I also have a youtube channel but also feel pressed to do video which I am not very good at. I also had issues with posting copyrighted songs that I am the owner of.
 
I signed up on Bandcamp a few days back and it seems to work fine and is free. But I have no long term experience with Bandcamp.
 
Also this may be true or not true, but for me, I had more issues with my free soundcloud account than I did after I got a pro account. I have no real way to know if that was because I got a pro plan or it just happened that way.
 
If I were going to test out something free, soundcloud would my first choice. What the hell...it's free so what have you got to lose by posting a few tunes there. Just sayin
 
Best of luck and if you find the super cool site that no one knows about I for one would like to hear about it.

Planobilly
I have been in this hunt for the last few days. I really like soundcloud but my account is a bit messed up and I have not received any email support as of yet to fix it. They do not have phone support. It is free and the free account will serve most peoples needs. They have two pro plans, one at $55 per year and one at around $140 a year. I don't mind paying the $140 a year but I am not happy with the lack of support when issues happen.
 
I also have a youtube channel but also feel pressed to do video which I am not very good at. I also had issues with posting copyrighted songs that I am the owner of.
 
I signed up on Bandcamp a few days back and it seems to work fine and is free. But I have no long term experience with Bandcamp.
 
Also this may be true or not true, but for me, I had more issues with my free soundcloud account than I did after I got a pro account. I have no real way to know if that was because I got a pro plan or it just happened that way.
 
If I were going to test out something free, soundcloud would my first choice. What the hell...it's free so what have you got to lose by posting a few tunes there. Just sayin
 
Best of luck and if you find the super cool site that no one knows about I for one would like to hear about it.

With Youtube, I get around the video thing by uploading my tunes through tunestotube.com.  You just need to upload an MP3 of the song together with a .jpg or .png image file.  I personally cannot be bothered to do anything more that that, as video really isn't my area of expertise and any actual video I tried to create would probably look horrible.
 
 
Bandcamp seems ok as far as I can tell.  I have uploaded my originals there.  I don't know how wide the audience is there though.

I also don't know how wide the audience is at bandcamp.
 
I did a short test looking for Blues and then old school blues. There is a ton of stuff that came up, but....it was everything from rock to rap and some stuff I would consider blues.
 
My point is that uploading a song to any of these sites may not expose your songs to much of anyone because there is no way for someone to find you.
 
After four years of being on soundcloud with about 100 songs under my name the results has been that people who know me found me because I contacted them directly and directed them to my account. The ones who wanted to keep up with what I do started to follow me.
 
People who I don't know from a few countries around the world said things like "stumbled across you and I like your stuff" and started following me.
 
If I upload a song to soundcloud and tag it as rock you can go there knowing I exist but do not know how I am listed and you will search for the next hundred years looking and most likely not find me.
 
Every song on a internet site is like a grain of sand on a very large beach and unless your grain of sand is next to "the Girl with the big blue eyes...lol" you may never get noticed.
 
There are ways to get around these issues but they cost time, money, lots of money. Go check out what labels actually do to get their artist found on the internet.
 
 

Planobilly
My point is that uploading a song to any of these sites may not expose your songs to much of anyone because there is no way for someone to find you.

I suppose I've been doing this since 2000 or so, at mp3.com, and it was always down to the artist to spam the forums. And therein lay a big problem with that site because at one point they started to give you "credit" on plays you received, and there was a big hoo har about cheating.
 
Fortunately, that's pretty much behind us now, but there is no substitute for hard work and pushing you stuff across the web.
 
And then there's offline to think about as well, back in the real world.
 
It's hard work, and although I might sound like I don't know much about this game, I did a two year stint in a band and we had an album of original material to flog, after paying for a glass master and having 800 CD's cut (I've still got 90% of my share in the loft). Phoning around all the shops around the UK was hard work, and we got nothing back. We even had a track from that album played on the John Peel show and that didn't help either...
 
Not that I'm bitter LOL...
 
 

synkrotron
I started a reverbnation page yesterday. But I went to upload my latest toon to that site and they have a limit of 8gb per song, so now I have to either make shorter tracks or convert to a lower bitrate. Not impressed...

8GB or 8MG? I'm assuming that was a typo and you meant MegaByte... otherwise I gotta wonder what kind of epic tunes you are writing. lol
 
8megs should be okay I think if you do export it to fit. There is a chart of how much music you can cram into a MB per minute based on bit depth and samplerates in the Sonar Ref guide (remember that a stereo file doubles that but that is also included in the chart). I don't use reverbnation but I'm assuming they also allow mp3 uploads as well which are obviously much smaller and can have really high quality anyway (but you can't export directly out of SOnar without the Lame encoder or the Cakewalk mp3 thingie installed which is why I have Pyro which does that stuff if I need).
 
So far I've been using soundcloud and when I first signed up it was great and it still serves its purpose BUT shortly after I signed up they did a redesign and now it pulls this autoplay stuff which kind of annoys me and has all sorts of weird script based silliness going on. I've been meaning to check out some of the other players to avoid this but haven't been uploading much anyway so whatever.
 
Some of the online file storage/sharing sites seem to be including "players" as well. Not sure how that works but I've been able to actually play tunes in dropbox and I thing onedrive recently. This could be part of the whole HTML5 revolution going on that allows browsers to play vids and audio without flash thingies or special server crap going on. But I don't know a whole heckuva a lot about that stuff.
 
HOWEVER if one were so inclined they could bypass those audio player sites altogether now by just creating their own webpage, storing the audio on their little hunk of server space then using HTML5 coding to serve up the audio. The downside is this could max out your bandwidth/storage limits for a cheap web hosting account and people who's browsers don't support such HTML5 features (older browsers) would be out of luck.