Dave Phillips from linuxaudio.org wrote some nice writings for linuxjournal about linux audio applications, system and midi configuration, loop-based music composition etc. You can find them
here. (Dave Phillips is a musician, teacher and writer living in Findlay, Ohio. He has been an active member of the Linux Audio community since his first contact with Linux in 1995. He is the author of The Book of Linux Music & Sound, as well as numerous articles in Linux Journal.)