"In the Mood" is a song by Canadian rock band Rush

Rush (band)

Rush is a Canadian rock band formed in August 1968, in the Willowdale neighbourhood of Toronto, Ontario. The band is composed of bassist, keyboardist, and lead vocalist Geddy Lee, guitarist Alex Lifeson, and drummer and lyricist Neil Peart...

 from their debut album, Rush. It was at least two years old when recorded for the album. It is three minutes and 34 seconds long and in 4/4 time.

The song was always performed in concert — often in a medley

Medley (music)

In music, a medley is a piece composed from parts of existing pieces, usually three, played one after another, sometimes overlapping. They are common in popular music, and most medleys are songs rather than instrumental. A medley which is a remixed series is called a megamix, often done with tracks...

, and usually near the end of the final encore — until the 1992 Roll The Bones tour, when it was dropped. In live performances, the line "Hey, baby, it's a quarter to eight" was often altered to include a woman's name in place of the word "baby."

The St. Louis Classic rock

Classic rock

Classic rock is a radio format which developed from the album-oriented rock format in the early 1980s. In the United States, the classic rock format features music ranging generally from the late 1960s to the late 1980s, primarily focusing on the hard rock genre that peaked in popularity in the...

 radio station KSHE

KSHE

KSHE is a rock & roll radio station licensed to Crestwood, Missouri which serves the Greater St. Louis area. KSHE is located at 94.7 MHz and currently uses the slogan "KSHE 95, Real Rock Radio". The station's studios have been located in the Powerhouse building at St. Louis Union Station since...

used to play the song every Friday night at 7:45 ("a quarter to eight").