information: besides the rock band from Kansas City there is a folk band from Victoria, Australia with the same name.
The Rainmakers were a Kansas City, Missouri-based original rock band, fronted by Bob Walkenhorst, which had a small string of hits in the late 1980s and early 1990s in the United States and Europe, especially Norway.
The Rainmakers were formed in 1983 as a three-piece bar band called 'Steve, Bob and Rich,' which "quickly became popular throughout the Midwest," according to one Amazon. Read more on Last.fm