Reijo Karvonen recorded "Lauantaisin" (On Saturdays) in 1975 and it was released as a single but this funky tune flopped chartwise. The original was called "Black Water". It was performed by US rock/soul/funk band Doobie Brothers and it was written by band memher Patrick Simmons. The song was released on their 1974 album "What Were Once Vices Are Now Habits" and fared well when released as a single, being the band's first number 1 single, You can see them perform it live, here.
Here's the pair:
7 hours ago