There are many questions looking for alternatives to Garage Band and Magix Music Maker on Linux. LMMS is the #1 answer to this question, with Audacity being a not too distant second. Imho, most of the responders assume the asker is wanting to make multitrack audio recordings, which Audacity will do well and Ardour, Jokosher, Reaper under Wine, et al will do just fine.
What I am looking for is the aspect of Garage Band that allows one to pull from a bank of samples and compose in that manner, without needing to actually play an instrument. (I work with people who don't have the physical ability to play an instrument, but have the drive to create music.)
LMMS does this relatively weakly (so far - I am indeed optimistic about LMMS). My main problem with LMMS is that the samples don't adapt to the grid tempo and there doesn't seem to be a way within LMMS to address this issue, at least not that my little mind is aware of. If there is already something like this, that would be very cool.
Unfortunately I don't program anymore (since ~1983 on Atari 400 Basic) or I'd be more than willing to help.
Btw, my system is a Core 2 Duo Optiplex 960 running Ubuntu Studio only - no multibooting.