Inspired by the title of the relevant Slashdot article, to the tune of My Bonny:
Your mashup is probably legal.
Your mashup is probably sound.
Your mashup is probably legal,
So pass all that data around!Stuff here
Stuff there
And something mashed up in between (be-tween!)
Stuff here
Stuff there
And something mashed up in betweenYour mashup is probably legal;
You could monetize it as well!
But though I contend it's all legal,
Remember I-A-N-A-L![Repeat chorus]