UnScramble this Word: o r k e s t?

Questions

Covers: GNR and Clapton performed Knockin' On Heaven's Door, but he wrote it:?

Covers: He's written songs for Meat Loaf, Bonnie Tyler, Sisters Of Mercy, and others.?

Covers: Laura Brannigan, U2, and Van Morrison all have songs by this name:?

Covers: No one's sure why, but Faith No More covered this Lionel Richie song:?

Covers: Rush doesn't do covers, but they swiped a few Paul Simon lyrics in this song:?