Game soundtracks with sounds effects.

Particularly where I remember sound effects being featured here and there would be in Mega Man music. Sometimes the sound effects give a little teeny taste of reliving the moment, like Zero's theme in Mega Man X2 where the track plays the sound effect of his health bar filling up when you're about to fight him (if you played the game that way).

A game like Rez would be one end of the spectrum where the sound effects actually make up a lot of the music and make it sound pretty sweet. On the opposite end, there are tracks that I remember fondly with a sound effect featuring in-game somehow but not on the track itself, though I wish it was there. In "Sigma Rebirth" from Mega Man X1 (where the final form of Sigma appears), there's a quiet gap at the end where I recall the 'health bar filling' sound that doesn't actually feature on the track.

The most notable example of those by far (in my opinion) is the stage clear fanfare of Sonic the Hedgehog 1 & 2. It just feels incomplete without that little ring jingle at the end.

Jam it back in, in the dark.