| The American Plague |
| The American Theatre Orchestra |
| The Americanos |
| The Ames Brothers |
| The Amity Affliction |
| The Amnesiacs |
| The Amorphous Band |
| The Amorphous Strums |
| The Ampersands |
| The Amplifetes |
| The Amps |
| The Ananda Project |
| The Ancient Novelties |
| The And/Ors |
| The Andantes |
| The André Previn Trio |
| The Andrea True Connection |
| The Andrew Oldham Orchestra |
| The Andrew Sisters |
| The Andrews Sisters |
| The Andrews Surfers |
| The Androids |
| The Angel Choir |
| The Angel City Brass |
| The Angel Whispers |
| The Angelic Gospel Singers |
| The Angelica Quartet |
| The Angels |
| The Angry Kids |
| The Animalhouse |
| The Animals |
| The Animals II |
| The Anita Kerr Quartet |
| The Anita Kerr Singers |
| The Anix |
| The Anniversary |
| The Anointed Pace Sisters |
| The Answer |
| The Antfarm Quartet |
| The Antlers |
| The Antonio Morelli Orchestra |
| The Ants |
| The Antti Sarpila Quartet |
| The Anything Muppet Animals |
| The Anything Muppets |
| The Apache Relay |
| The Apartments |
| The Apemen |
| The Apers |
| The Apex Theory |
| The Appalachian Orchestra |
| The Appalachian Pickers |
| The Apparitions |
| The Apple Bros. |
| The Applebaum Jazz Piano Duo |
| The Applejacks |
| The Apples |
| The Apples in Stereo |
| The Appleseed Cast |
| The Applicators |
| The APX |
| The Aquabats |
| The Aquatones |
| The Arabian Prince |
| The Arbors |
| The Arc Angels |
| The Arcade Fire |
| The Archies |
| The Architects |
| The Archives |
| The Arcs |
| The Aristocats |
| The Ark |
| The Armchair Resistance |
| The Arrogant Sons of Bitches |
| The Arrogant Worms |
| The Arrogants |
| The Arrows |
| The Art Ensemble of Chicago |
| The Art Farmer-Benny Golson Jazztet |
