Several other threads made me consider this topic - - which songs did you usually hear played back-to-back on the radio, and you cannot listen to one without thinking of the other? Here's a few starter thoughts - feel free to add your own:
Led Zeppelin - Heartbreaker / Living Loving Maid
ZZ Top - Waitin' for the Bus / Jesus Just Left Chicago
Journey - Feeling That Way / Anytime
Van Halen - Eruption / You Really Got Me
And, to add one that's a little more obscure (just because I like it, and the segue is so great):
Allman Brothers Band - Don't Want You No More / It's Not My Cross To Bear
Led Zeppelin - Heartbreaker / Living Loving Maid
ZZ Top - Waitin' for the Bus / Jesus Just Left Chicago
Journey - Feeling That Way / Anytime
Van Halen - Eruption / You Really Got Me
And, to add one that's a little more obscure (just because I like it, and the segue is so great):
Allman Brothers Band - Don't Want You No More / It's Not My Cross To Bear