Single question music quiz.

[Techno 3]

For Christmas....though it's got nothing to do with Christmas.

What links the tracks...

"Brain salad surgery", by Emerson, Lake & Palmer
"Sheer heart attack", by Queen....and
"Houses of the Holy", by Led Zeppelin ?

To put it another way, what have the above tracks got in common ?

[Raider4]

None of them appear on the albums of those names.

/smug grin...

Happy holidays everyone. 

[Techno 3]

Smug grin is allowed.