RateYourMusic is basically the Wikipedia of music (and film, but no one uses it for that). It lets you review, rate, and catalogue albums and bands, as well as add new entries for bands and releases, and even has a primitive (yet effective) forum. I quit like the list functionality, though I've not made any of my own. If you use it, add me: https://rateyourmusic.com/~ChrysanthemumBang