Blues
Blues
Otis Rush 29
Omar & the Howlers 25
Otis Taylor 16
Otis Spann 21
Odetta 23
Otis Clay 12
Oli Brown 5
Otis Grand 11
Owen Campbell 5
Our Native Daughters 
Otis Blackwell 
Oreo Blue 7
Oscar Benton Blues Band 
Oscar Benton 10
Omar Dykes 2
Ollie Nightingale 4
Oliver Sain 3
Old Time Country & Blues Revue - Oz Noy Trio 2
- Original Beach Music Band 2
Olu Dara 2- One Man Mormon Blues Band 2
Oteil Burbridge 2- O.B. Buchana
- Original Legends Of The Blues
Orville Johnson 3- Old Gray Mule 3
- Otha Turner
- Oliver Wood
Odell Harris 
One Shot Johnny - Outta d' Blues
- Osgood & Blaque Blues Band
- Oven Mitt Johnson
Orb Mellon 
Oo-Bop-Sh'Bam - ORPLID Blues Band
Onesko Bogert Ceo Project 
Oscar Jordan 2- Oneway-up
On the Level 2- Othella Dallas 2
- Other Mules
- Owen Poteat
- Olivia Sylvester
- Outside Royalty
- NEW — Artist has been updated in past 30 days
- Artist 3 — number of albums
