Allmusic
This is my favorite website for answering all the questions we get about bands and artists. I love all the links within the pages that let you easily explore “meaningful connections between artists and the music,” such as learning more about individual artists who have side projects or have been part of multiple groups, or finding music that is similar to bands you know you like. It also includes historical information and extensive genre tagging. I’ve looked up some pretty obscure artists here, and there is always an entry. Information is current, and I’ve never noticed an error. There is also news, editorial content, and you can listen to tracks (not that this is part of our job as ready reference librarians, but just so you know!)