[linux-audio-user] apps for practicing improvisation

[Gilles Degottex]

Hi,

I'm looking for softwares to practice improvisation, chords grids, 
beat/mesures following, etc.

I found on or two interesting apps, but I want to know of your experiences :)
someone know of good web site for ressources, drums rythmes, grid files, etc ?

for example, hydrogen seems really usefull, but I found no web sites with a 
lot of h2song files.

Thanks in advance,
Gilles