Which song became The Temptations' first U.S. No. 1 pop hit single in March 1965?

The Temptations' first U.S. No. 1 pop hit single in March 1965 was "My Girl". It is a soul music song recorded by the Temptations for the Gordy (Motown) record label. Written and produced by the Miracles members Smokey Robinson and Ronald White. Later in time, the song would become the group's signature song.

Robinson's inspiration for writing "My Girl" was his wife, Miracles member Claudette Rogers Robinson. The song was included on the Temptations 1965 album "The Temptations Sing Smokey". In 2017, the song was selected for preservation in the National Recording Registry by the Library of Congress as being "culturally, historically, or artistically significant".