One note on MP3 sound quality:

As a sound designer, I have discovered that in performance spaces with a lot of flutter echo, tracks recorded from MP3s tend to sound better than tracks recorded directly from CDs. This may be because of the 'inaudible' sounds that are removed during compression, leaving less sound to bounce off the walls. There is one theater I've worked in that is particularly bad when it comes to echo (concrete walls and nothing soft to absorb sound); in most cases, the flatter, muffled sound of the mp3 track is much better in the space than the sound from the original source, as the sound bounces so much it is almost impossible to hear clearly.