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Just Bass

Heh, if you could change it to midi then you'd have already done it.

there is no way to convert audio into midi format.

well, there have been attempts, but ultimately they have failed.

MIDI is a data format, it does not play audio, it plays programmed 'events' that are translated into audio by software.
 
Nope, there have been attempts as I mentioned before, but there is too much background noise in audio files for a midi decoder to get a clear line, you'd end up with lots of overtones and stuff.

Like, take a tuner, and put it up to a speaker, and then try and learn a line by the notes the tuner calls out while the music is playing, that'd be what it's like for the computer to do it.
 
Ok, there might be a (expensive) solution: convert the MP3-song into WAV. Read the WAV-file into a MATLAB-variable (Invalid Link Removed) and play around with the (expensive) Signal Processing Toolbox. An advanced band-pass digital filter may work for your song. ;)

Seriously, there is no easy way to get rid of "unwanted" music-information in a recording. Sorry!

/MrBaloo