Paul McCartney to Warner Bros. in 8 Steps

1. Paul McCartney wrote Blackbird
2. Blackbird was written by John Lennon
3. John Lennon produced Subterranean Homesick Blues
4. Subterranean Homesick Blues features guitar played by Danny Kootch
5. Danny Kootch played guitar for Pussy Cats
6. Pussy Cats includes saxophone played by Trevor Lawrence
7. Trevor Lawrence arranged I Need You
8. I Need You was published by Warner Bros.

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