Which Eagles song became their first number-one single in the United States?

"Best of My Love" became the Eagles' first number-one single in the United States. Written by Don Henley, Glenn Frey, and J. D. Souther, it appeared on the band's 1974 album On the Border.

The song was released as a single on November 5, 1974, and reached No. 1 on the Billboard Hot 100 in March 1975. It also topped the U.S. easy-listening chart for one week. Don Henley sang lead vocals, with the band's layered harmonies and restrained acoustic arrangement giving the track a notably polished sound.

Its path to release was unusual. Glenn Frey was reportedly reluctant to issue it as a single, but a Michigan radio programmer began playing the album track and noticed a strong response. A limited local test release followed before Asylum Records issued it nationally.

The Eagles' later chart-toppers included "One of These Nights," "New Kid in Town," and "Heartache Tonight." Those songs became major No. 1 hits, but "Best of My Love" came first.