It there a way to import a song then extract the drum track and convert it to midi?

In a word, no. Drum Replacer can be tweaked to pick out the kick, snare, and other distinctive kit pieces from a drums-only track or maybe a full mix if it's not too 'busy', but hi hats, tom fills, and complex cymbal work can be difficult or impossible to extract.

Here's a little trick if your willing to do the work. 
I've often been asked to make the backing tracks for recording of songs that were a bit complicated and I'd never heard before. Here's a way to create a midi backing from scratch. This depends on how complicated the song is, so lets assume a basic pop song. 
 
First dump the song to a audio track. 
Now change the track from Clips to Audio Transients. 
Now change the project tempo until the transient markers line up , you can also try dragging the audio to the time line to creat a tempo map, but this is often a mess of 1,000 tempos. I find most popular music is recorded to a clock and follows a set tempo.. it might be 123.76 BPM. It will be close enough. 
 
Now load up AD2 and play along with the song making passes to add each part. I'm pretty good at playing Kick/snare in one go. If it's a crazy drum track than you might be a while :) 
Now I play the bass along, drag it to a midi track and edit.  
Then I play along on piano etc. 
At a point you can shut off the original track and your will be getting there. 

Interesting stuff. Thanks guys.
 
I have played around with drum replacer and Tracker in SD3 with no luck, even trying to convert a straight drum track made with acid wav files. Probably just me not understanding it very well yet.
 
Question though Cactus, does your method have be done with AD2 or will SD3 work?

Just curious - do you mind sharing the band and name of thesong in question?  There may be midi versions available, if the song was commercially released.
 
Bob Bone

Depending on the track it is somewhat possible using a couple methods:

1) upgrade to editor version of melodyne which handles polyphonic sounds. You may be able to isolate components and convert to midi.

2) on a simple track with sounds that are very distinct in spectrum, one could filter sounds ( a lowpass that cuts off everything but kick) , use that sound via sidechain to trigger sound and create midi track based off of result.

Both require just the right track and/or tremendous work. It may be easier to recreate on tour own, using imported track as reference.

Free Interactive Source Separation Editor maybe.
http://isse.sourceforge.net/

robert_e_bone
Just curious - do you mind sharing the band and name of thesong in question?  There may be midi versions available, if the song was commercially released.
 
Bob Bone

Nothing specific honestly. I saw another thread about converting audio to midi and it made me start thinking about it.
 
Usually, if I want to do a cover or make a backing track I will find the best Guitar Pro tab with the drum track and simply export it as midi. Sometimes there needs to be some tweaking. But it's usually ok.
 
My question was based mainly on songs that are not already tabbed. Are there other sources for this than Guitar Pro?

bitman
Free Interactive Source Separation Editor maybe.
http://isse.sourceforge.net/

This certainly looks interesting. Thanks!