A Cappella Almanac: Official site of CASA, the Contemporary A Cappella Society of America, a worldwide clearinghouse for all-vocal music. News, events, groups, albums, tips and advice, reviews, classifieds, web directory, and library of available song arrangements

Dorough, Bob: Official site biography mentions his vocals with Miles Davis as well as work with Dave Frishberg, Blossom Dearie, and the "Schoolhouse Rock" TV series. With links to interviews and articles as well as calendar of appearances

Ella Fitzgerald: Official website including biography, quotes, awards, screensavers and recordings

Rockapella: Official site. Provides history of the group, member profiles, tour dates, discography and photo galleries