I've got a brand new... (Quiz #403)

1. James Brown won his first Grammy Award for his 1965 hit "Papa's Got A Brand New Bag". But who or what is the subject of the song?

2. In 1972, the singer Melanie had a hit with "Brand New Key", a song about a girl with roller skates trying to attract the attention of a boy. But what was the song said to have hidden in the lyrics, which got it banned from some radio stations?

3. In 1975 The Wurzels had a hit with "The Combine Harvester", in which they sang:
I got a brand new combine harvester
An' I'll give you the key
Come on now let's get together
In perfect harmony
I got twenty - WHAT? -
And you've got forty-three...