If is the second track on Pink Floyd's fourth album Atom Heart Mother from 1970.
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If I were a swan, I'd be gone
If I were a train, I'd be late
And if I were a good man, I'd talk with you more often than I do
If I were asleep, I could dream
If I were afraid, I could hide

If I go insane, please don't put your wires in my brain
If I were the moon, I'd be cool
If I were a rule, I would bend
If I were a good man, I'd understand the spaces between friends
If I were alone, I would cry
And if I were with you, I'd be home and dry
If I go insane, will you still let me join in with the game?

If I were a swan, I'd be gone
If I were a train, I'd be late again
If I were a good man, I'd talk with you more often than I do