India's leading watch manufacturer is famous for its ads' theme music. As kids, most of us didn't know that it borrows from Mozart's famous Symphony No. 25 in G minor.
Their early advertisements were splendid, touching, and we waited for the 'Titan music' to play. My friends and I would hum the tune occasionally.
This post features the various Titan ads, and how well they have employed the music.
But before that I'd like to start with Beethoven's music featuring in the ad for a game:
Gears of War 2