B: Read up on the linux-sound.org
site. On the page for Linux audio software bundles and distributions you can find several different options.
is a set of packages to be applied to Redhat 9 or Fedora Core 1/2/3. From the blurb on the homepage:
Planet CCRMA (CCRMA is pronounced ``karma'') at Home is a collection of rpms (RPM stands for RedHat Package Manager) that you can add to a computer running RedHat 9 or Fedora Core 1, 2 or 3 to transform it into an audio workstation with a low-latency kernel, current ALSA audio drivers and a nice set of music, midi, audio and video applications.
Another option for a distribution focused on audio is demudi
which is a Debian distribution fine tuned for musicians.
I use Gentoo and have found it easy to install and use music software on it. I am mainly experimenting with Ardour and JAMin - editing and mastering things on my laptop at home (or whatever) that were recorded in a studio.
C: IMHO any Linux distribution would do well for writing. OpenOffice, AbiWord, etc comes with most distributions by default.