It could be anything from ad-libs to instruments used to backing singers or even certain lyrics or parts of the song.


My own list:

1. The way the guitar strings fade out at the ending of Codes by Ellie Goulding as well as the "Coddesssss" and "aah!" echos in the chorus

2. The Electric guitar & drum bass part near the ending of Jealous by Beyonce.

3. The guitar instrumental in the production of Sometimes by Ariana Grande.

4. The harmonica parts in Sex with Me by Rihanna as well as the "You know I got the sauce!!!!! You know I'm saucy!!!" lyric.

the synth at the end of west coast by lana del rey

The whistles, the sirens, the robotic "la la la la la" and the electronic beats in Keep On Dancin' by Ellie Goulding.

The high pitched sounds at the end of Bed of Lies