Question: The Marvelettes was an American girl group that achieved popularity in the early- to mid-1960s, and were the first major successful act of Motown Records after the Miracles and its first significantly successful girl group after the release of which 1961 number-one single, a song written by Georgia Dobbins, William Garrett, Freddie Gorman, Brian Holland, and Robert Bateman?
Sentence (from "Please Mr. Postman"): The single achieved this position in late 1961; it hit number one on the R&B chart as well.
Relevant evidence: No