One Thing at a Time made famous by Morgan Wallen
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Old Time Rock & Roll made famous by Bob Seger
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Out There made famous by The Hunchback of Notre Dame (1996 film)
• 1 music track in instrumental version
• 1 music track with vocals (cover)

Oh Happy Day made famous by Sister Act
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

One Love made famous by Blue
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Oh What a Beautiful Morning made famous by Oklahoma! (musical)
• 1 music track in instrumental version
• 1 music track with vocals (cover)

One and Only made famous by Adele
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Once Upon a December made famous by Anastasia (1997 film) (Liz Callaway)
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

One More Time made famous by Blink-182
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Overdrive made famous by Ofenbach (DJs) & Norma Jean Martine
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)