Song Styles for Artists / O
- O'Jays, The 2
- Oasis 4
- Odyssey 2
- Offenbach 1
- Oklahoma 1
- Old Dominion 1
- Oleta Adams 1
- Olga Tañón 1
- Olivia Newton-John 4
- Olly Murs 1
- One Direction 2
- OneRepublic 1
- Opus 1
- Orchestral Manoeuvres in the Dark 1
- Original Dixieland Jazz Band, The 1
- Osmonds, The 2
- Otis Redding 2
- Otis Rush 1
- Ottawan 2
- Outfield, The 1