Misc: In the Ian Fleming novel "Goldfinger", what was Goldfinger's first name?

Questions

This group song the 1978 #1 "Baby Come Back"...?

This man sang lead for the 4 Seasons comeback #1 hit in 1976, "Oh What A Night"?

This singer's "Escape (The Pina Colada Song)" was the last #1 of the 1970s...?

This song spent more weeks at #1 than any other in the 70s?

This was Abba's only #1 song...?