Before I even get into the subject, let me just state up front: I know there are plenty of other songs that are usually played back-to-back on the radio. These are just some of my favorites. How about you all? Let's hear what some of your favorite pairs are in the comments below.

1 & 2) "Heartbreaker" and "Living Loving Maid (She's Just A Woman)" "“ Led Zeppelin

These two songs open side 2 of the 1969 release, Led Zeppelin II, the second studio album the band put out. In all my years of listening to the radio, I've never, ever heard them played separately. Interestingly, however, when the band played "Heartbreaker" live, they NEVER went directly into "Living Loving"¦" because guitarist Jimmy Page hated the tune.

Also interestingly, on many of the bootleg recordings I own, in the middle of the extended "Heartbreaker" guitar solo, Page starts playing Bach's "Bourrée in E Minor." This is later mocked in the movie This is Spinal Tap. During a performance of the song "Heavy Duty," the band suddenly breaks into a minuet by composer Luigi Boccherini.

3 & 4) "Sgt. Pepper's Lonely Hearts Club Band" and "With a Little Help from My Friends" "“ The Beatles

sgt_pepper.jpgThese two songs open the eighth studio album released by the Beatles, the 1967 release, Sgt. Pepper's Lonely Hearts Club Band. While you might think the crowd sounds interspersed in the transition between the two songs are Beatlemania-Ed-Sullivan-Show-esque, they actually have nothing to do with the band. Yes, they were recorded years earlier. Yes, they were recorded by producer George Martin, but those cheers are from a British theatrical show called Beyond the Fringe, which was very popular in the early '60s.

5 & 6) "Eruption" and "You Really Got Me" "“ Van Halen

Van Halen 1979.jpgOff their groundbreaking eponymous first album from 1978, these two songs come after the opening track, "Runnin' with the Devil" on side 1. "Eruption" is, as most people know, one of the most famous guitar solos of all time. It, too, has something in common with the "Heavy Duty" mockery noted above, in that the chord structure is ripped from traditional Baroque tunes (like the Bach and Boccherini pieces mentioned).

Though VH's remake of The Kink's "You Really Got Me" is often played alone, I've never heard "Eruption" played alone on the radio. (It's not even two minutes long.) It's always followed by the Ray Davies' cover.

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