5 songs that sound as if the Partridge Family is singing backup

Say what you will about the Partridge Family (bubble gum, fluff, fabricated pop) but whoever the singers and musicians actually were on those recordings really created some fun, well-crafted tunes. Other than Keith Partridge's excellent lead singing voice, probably the most distinctive characteristic of their sound was the lush, layered background vocals. I'm pretty sure they were all studio singers, but I swear I can hear Shirley in the mix. Anyway, use your imagination when you listen to these (titles link to YouTube):

1) Day After Day - Badfinger



2) Share the Land - the Guess Who (this one also sounds like Keith is singing lead!)



3) We've Only Just Begun - The Carpenters



4) Tequila Sunrise - The Eagles



5) Sun King - The Beatles