save them as backup just in case you lose your mp3 files. unless you have variable bit rate (vbr) mp3 today, where the technology adjust the sampling rate variably depending on the audio segment, from 128 kbps to 320 kbps, you're better off listening to cd quality music. mp3 audio quality becomes more in line with cd when you increase the sampling rate to 256 kbps. most older mp3 format are in the 128 kbps to 192 kbps range, which in home hi-fi settings are horrible to the discerning ear. for walking, jogging, biking or driving with street noise, 128 kbps mp3 will do. but at home in quiet solitude (without ah neh disturbing your peace), you can enjoy hi-fi audio on a vbr mp3 player or at least a 256 kbps mp3 player. your files are larger, of course, with higher bit rates.