No,"Rio" didn't chart in America at all.
It was a top 40 hit in other countries,but in the U.S. ,Former Monkees
members were about as welcome on the charts & radio in the late 1970s as Pat Boone.
Too bad for Nesmith though,it's a good song & brilliant video for it's time.
Speaking of one hit wonders,just received (in the mail) a copy of the 1981 hit "Precious To Me" by Phil Seymour (#22). He was a former member of The Dwight Twilley Band,that hit #16 in 1975 with "I'm On Fire".
After that,I'm expecting the "final" top 40 hit
of the 1980s I nedd to have "all" of the hits of the 80s.
That's right. It took from 1980s itself but in a few days "Love Changes Everything" by Climie/Fisher (#23 1988) will be in my collection. (Only 99cents plus shipping...from the UK!

Worth it thoguh,better than most U.S. sellers & no record store in Phonix has it.
The 70s are still a long ways off to be
done,over 150 acts. One,two and 3 hit wonders.