Artists are sorted according to their surnames
| Artist |
Number of songs |
| O NEAL JAMIE |
25 |
| O Town |
3 |
| O'Connor Sinead |
44 |
| O'Neal, Jamie |
7 |
| O+S |
3 |
| O-Town |
4 |
| O-zone |
35 |
| O.S.T Twilight |
25 |
| O5 a Radeček |
28 |
| OAR |
2 |
| ODC |
1 |
| OLEANDER |
33 |
| OMD |
7 |
| OOMPH! |
204 |
| OT Bend |
44 |
| OXA |
6 |
| Oakenfold,Paul |
1 |
| Oasis |
95 |
| Obama Girl |
2 |
| Obie Trice |
4 |
| Obituary |
104 |
| Obscura Camera |
1 |
| Obří broskev |
29 |
| Oceana |
3 |
| Oceán |
32 |
| October Fall |
12 |
| Of mice and men |
11 |
| Offishall,Kardinal |
9 |
| Offspring |
195 |
| Oh sleeper |
21 |
| Oi Polloi |
8 |
| Ok Go |
6 |
| Okoř |
1 |
| Old Boys |
2 |
| Old Man's Child |
58 |
| Oldfield, Mike |
16 |
| Olga Lounová |
4 |
| Olive |
1 |
| Oliver |
0 |
| Oliver, James |
14 |
| Olivia |
12 |
| Olivia Newton John |
48 |
| Olmerová, Eva |
6 |
| Olsen Brothers |
1 |
| Olson, Olivia |
3 |
| Olta Boka |
1 |
| Olympic |
232 |
| Omarion |
12 |
| Omega Lithium |
11 |
| Omer Bhatti { O-Bee } |
0 |
| Ondřej Hobza |
13 |
| One Band |
0 |
| One More Time |
5 |
| One Night Only |
8 |
| One Pound |
1 |
| One Republic |
73 |
| One T & Cool T |
2 |
| One night band |
2 |
| One star story |
8 |
| One time |
1 |
| One-t |
2 |
| Onions, Oliver |
4 |
| Onono Ben |
1 |
| Opak |
9 |
| Operace Artaban |
7 |
| Opeth |
125 |
| Opus |
2 |
| Orange Blue |
4 |
| Orange County Girl |
1 |
| Orbison, Roy |
3 |
| Ordinary girls |
1 |
| Oreiro, Natalia |
91 |
| Organic petrol |
4 |
| OriKoule |
14 |
| Orianthi |
6 |
| Orion |
38 |
| Orlík |
44 |
| Orrico, Stacy |
54 |
| Orson |
3 |
| Ortel |
51 |
| Orton Beth |
1 |
| Osborne, Joan |
29 |
| Osbourne, Kelly |
29 |
| Osbourne, Ozzy |
238 |
| Osment, Emily |
53 |
| Otep |
101 |
| Ottawan |
6 |
| Otto's Daughter |
1 |
| Ouchène,Patrick |
2 |
| Our Last Night |
42 |
| Outen, Savannah |
17 |
| Outhere Brothers, The |
2 |
| Outkast |
25 |
| Outlandish |
7 |
| Outlawz |
3 |
| Outsider |
4 |
| Overground |
7 |
| Overseer |
4 |
| Ovi |
1 |
| OvoceLenina |
2 |
| Owl City |
48 |
| Oxenryd,Sandra |
1 |
| Ozzák a vysací zámek |
1 |
| O´neal, Jamie |
21 |
| Očko |
1 |
| Očko, All stars |
3 |
