[LAU] outfitting a computer for songwriting in linux?

Hi All, I've been a reader on the list for a while, not a poster until now. I am preparing to outfit a computer for songwriting in Linux. I will be using the command line notation options, of which there are rather a few from Lillypond to muscript. I am hoping that how I picture this will match the creative reality smiles. My first question is this. some high end soundcards that are supported in Debian? I know its been updated, but I intend using squeeze for a start. Getting the floor solid before say adding updated furniture. While I know that four duplex cards are common, I want the best quality I can find for the work. say if you <hope this makes sense> wanted to connect a full sized piano keyboard to the card? Thanks in advance, Karen