This could be music scores, opening theme or ending credits. I have a few because I probably watch more TV than movies, so: Twin Peaks (opening credits and love theme), Dexter(opening credits which was my ring tone with my first real smartphone) Steven Universe (closing credits), Doctor Who (everything!) ? Flight of the Conchords (opening credits), Stranger Things (opening credits and score), even though I never watched Star Trek in earnest, my mom does, so ST: DS9 (opening credits), The Crown (opening credits was produced by Hans Zimmer), House M. D (theme was actually Teardrop by Massive Attack) older stuff: Perfect Strangers, The Golden Girls, Magnum P. I., Knight Rider, Peter Gunn are all memorable themes too.