Sync is short for synchronize. If you wanted to synchronize audio with video, then all the right sounds would play in accordance with all the right actions in the video, exactly on time. Syncing music usually means editing your video to match the beat or mood of the song at a specific time. For example, action should begin at a beat and during cool parts of the song you can have a less lively clip playing.
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lip sync
Syncing contacts generally refers to loading contacts from one devise to another. For example, you can sync the contacts on your phone to a tablet, a computer, or another phone.
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Music played in a harmonic, chordal texture.
Actually, they do play the music, and sing the song in the music video, but the sound is not recorded. They put the studio audio over the music video once it's done. But they DO play it and sing it, it's just not recorded. It would be very hard to mime singing and mime playing the guitar...