Music Term: - The first degree of the scale or a triad built on that degree.?

Questions

Accroding to this 1978 song, what do the angels want to wear?

EC song done by Roy Orbisson on his Black & White Night Live concert?

Great New Orleans Brass band that has worked with EC a couple of times?

Guitarist who has worked with both Costello & Tom Waits?

What does Ms. Macbeth have that she keeps under her chin?