Hi!
When I listen to my microphone recordings I can always hear the music silently in the background.
So I tried using hearing protections with 3,5mm audioinput (I dont know the right word in english, but here is a picture ).
But still I could hear the music silently in the background.
 
So I disconnected the microphone while I was recording and the music was still in the recording even without the mic on.
Is there an option somewhere which can prevent this?
 
The problem isnt only in Sonar and "record what you hear" is not activated.
Im using Creative x-Fi soundcard, win7, Sonar X3
 
Sorry for my bad english, Im really tired and Swedish at the moment... ;)

Sorry I am not clear on what the situation you are trying to describe actually is. Are you saying there is some music that is not the music you are trying to record 1. being recorded or 2. being played back via monitoring while you are recording through  a. the speakers attached to your sound card or b. headphones? 
If so that suggests an analogue signal leak of some sort from a radio broadcast, or other source that is being picked up in your audio system somewhere. Alternatively, it could be an actual sound in your recording room that is masked or too quiet for you to hear but which you are amplifying during the recording process to a level that you can hear. 
 
Or are you saying that you are hearing the music that you are trying to record echoed over again in the recording?

and, just to be clear... you are not picking up the sound from your headphones when laying down the vocal, right? Certainly sounds like that...

Im really tired and Swedish at the moment... ;)

 
Swedish for the moment? What will you be after you've had a nap? Norwegian? 
 
Sounds like crosstalk within the audio interface. Soundblasters will do that. Nothing you can do about it, though, aside from upgrading your sound card.

+1 to bitflipper on both counts :D

Thanks for the replies!
 
Im still Swedish this morning, thank the gods for that! 
 
If I disconnect the microphone and press record, then Sonar will record the music as if the mic was hearing my music from my headphones. So it´s probably sound leakage as you suggested... 
 
If I remember right I did not have this problem with windows XP.
Maybe the soundcard is old or need some other drivers?
 
Now when I record, I play the music from my phone with headphones and record the vocals in Sonar.
Then there is no leakage, but its more work this way.
 
Which sound card can you recommend? I´m no way professional or wealthy.
RME?

- double post - 

You can't go wrong with RME, but it's at the high end of the prosumer price range. When I had to replace my interface earlier this year, I did a lot of research because I could not afford the RME I'd always wanted.
 
That investigation led me to Focusrite products, which offered the best value for the features I needed. I ended up with a Saffire Pro 40 and have been pretty happy with it. That's a Firewire device, though, so if you don't have a Firewire port on your computer you'd want to look at the Scarlett series, which are identical except they're USB.

I really think this is a setting like the "what you hear" somewhere in a screen that you/we haven't found yet. Soundblasters aren't great but there is no way that there is THAT much hardware leakage between the inputs and ouputs. While I would recommend a more professional card in general (RME is considered top notch but relatively pricey and probably more feature-rich than you need) I think in this case you should be able to get this working with a few mouse clicks.

Does the Soundblaster come with a mixer or settings app? There is also the Windows audio and playback devices menu thingy. Try and look if there is something set there that shouldn't be. If it's not too much trouble, provide screenshots of all the relevant screens. i'm sure we can figure this out!

This is how it sounds when the microphone IS NOT connected to the computer:
 
 
 
Here is a picture with the settings from Creative console, win7 sound options and Sonars Audio Devices:

 
No "What-you-hear" selected.
Want to see some other settings? Im happy to help you help me! 
 

bitflipper
You can't go wrong with RME, but it's at the high end of the prosumer price range. When I had to replace my interface earlier this year, I did a lot of research because I could not afford the RME I'd always wanted.
 
That investigation led me to Focusrite products, which offered the best value for the features I needed. I ended up with a Saffire Pro 40 and have been pretty happy with it. That's a Firewire device, though, so if you don't have a Firewire port on your computer you'd want to look at the Scarlett series, which are identical except they're USB.

 
Focusrite and Scarlett are external sound cards. I would like a internal sound card because music isnt something I do everyday and I want a clean desk. But thanks for the advice!!
Any advice what I should look for in a sound card for music creation?
I use a 6,3mm microphone (with a 3,5mm adapter) and a USB midi-keyboard. And I use 3,5mm analog output and a digital optical output.
It should support ASIO too, right?