[Response to Sushan's xanga on blackbird copyleft]
Just found there is also Bow Wow Wow, represented by EMI, which the song itself encourage you to duplicate their songs with yr own tape in the 1980.

...
off the radio I get a constant flow
hit it, pause it, record it and play
turn it, rewind, and rub it away
...
C30 C60 C90 Go
...
Policeman stopped me in my tracks
said "Hey you, you can't tape that
you're under arrest 'cause it's illegal"
So I shoved him off and blew his whistle
I'm a pirate and I keep my loot
So I blew him out with my bazooka
...
C30 C60 C90 Go
...

From Wiki:
Their label at the time, EMI, refused to promote the cassingle "C30, C60, C90, Go" because it allegedly promoted home taping, as Side B was blank. EMI dropped the group after releasing its second single.