I can recall a number of them.
My several personal experiences:
1964. I entered a 30 station market of about a million population with its first Top 40 station and first non-block programmed one, too. Was told it would not work by advertisers and made fun of by other station owners; one called it the "pocket station" as teens would listen on pocket transistor radios. 6 months later sold out at market's highest rates; it was #1 in share.
1975 Put on Puerto Rico's first pure AC station. Even the record companies would not give service as they thought the format was going to be unsuccessful on "the tropical Island" and would be boring. Local magazine made fun of it. First book #1 women, #2 overall.
1979 Put on world's first all salsa station. Same comments from the press: very boring with no variety and would be tiring to listen to. First book, 22.5 share. Second book 33.5 share in 30 station market. Billed three times more in first month than it ever had billed before. Still top 3 or 4 44 years later.
2000 Put on an all local artist rock format in Buenos Aires, a 20 million person metro. Never done before, and ridiculed in the press as too limited. Averaged a 20 share, often double the #2 station. Still top 5 23 years later.
In each case, though, the format was totally new to the market. Not a rehash of a previously failed format; I think that trying to resurrect the dead is not going to work in this case.