Comment by ThinkingGuy

Besides artist, title, and album, I also make sure to include release year and genre (and I'm not really particular about genre definitions - about 90% of my music falls under "rock," "pop," "jazz," or "soundtrack"). I add album art, too. I started digitizing my collection 15 years ago, ripping from CDs and cassettes, and have never regretted not adding any more metadata.