Over the Rainbow made famous by Josh Groban
• 1 music track in instrumental version
• 1 music track with vocals (cover)

Oklahoma City made famous by Zach Bryan
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Only the Lonely (Know the Way I Feel) made famous by Royal Philharmonic Orchestra & Roy Orbison
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Only the Lonely (Know the Way I Feel) (With the Royal Philharmonic Orchestra) made famous by Roy Orbison
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Oye cómo va (Album Version) made famous by Santana
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Only Happy When It Rains made famous by Garbage
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

Omigod You Guys made famous by Legally Blonde (musical)
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

One Short Day made famous by Wicked (musical)
• 2 music tracks in MP3 instrumental version
• 1 music track with vocals (cover)

One Day made famous by Matisyahu & Akon
• 2 music tracks in MP3 instrumental version
• 3 music tracks with vocals (covers)

One Day made famous by Akon & Matisyahu
• 2 music tracks in MP3 instrumental version
• 3 music tracks with vocals (covers)