One Music, Two Songs

I've heard a couple new songs with good o' familiar tunes recently. Two songs in one music, anyone?

Red Hot Chili Peppers - Dani California
Lynyrd Skynyrd - Sweet Home Alabama

Paul Oakenfold & Brittany Murphy - Faster Kill Pussycat
Bodyrockers - I Like The Way You Move

Muse - Supermassive Black Hole
Britney Spears - Do Something

Rihanna - SOS (Rescue Me)
Soft Cell - Tainted Love

The Strokes - Razorblade
Barry Manilow - Mandy