Billboard #1 Hits: #379: ” Bad Blood”- Neil Sedaka. October 11, 1975. #1 for 3 weeks on Billboard Hot 100.
- Single:”Bad Blood”- Neil Sedaka
- Record Company- Rocket/MCA
- Genre: Pop
- Written by Neil Sedaka and Phil Cody
- Time: 3:09
- B-side:”Your Favorite Entertainer”
- Album- The Hungry Years
- Grade: B-
- Peaked at #1 3 weeks in Billboard Hot 100. #1 in Canada.
Sedaka Is Back! His second #1 in two years- “Laughter In The Rain” went to #1 in 1974. Uncredited backing vocals on this by Elton John. At this point of the 70’s Elton was ruling the pop singles chart- so having him on it- and he is clearly heard- surely gave the single a boost. “Bad Blood” was replaced by Elton’s “Island Girl” at #1.
slicethelife 
I just never cared for this song, and was shocked when it spent 3 weeks at #1. But like you point out, with the red-hot Elton John involved, it was all but certain to be a surefire hit.