Pomplamoose, a boyfriend-girlfriend "band", created the concept of the VideoSong, which has two rules:

1. What you see is what you hear (no lip-syncing for instruments or voice).
2. If you hear it, at some point you see it (no hidden sounds).

I've always loved the sultry sound of lead singer Nataly Dawn, as seen/heard here the Pomplamoose cover of "Single Ladies":