Blackbird to How Can I Be Sure of You in 6 Steps
- Blackbird was written by Paul McCartney
- Paul McCartney produced Mary Hopkin's recording of The Puppy Song
- The Puppy Song was covered by David Cassidy
- David Cassidy recorded The Story Of Rock And Roll
- The Story Of Rock And Roll was sung by Harry Nilsson
- Harry Nilsson wrote How Can I Be Sure of You