Skipping 15 seconds exists for podcasts, but for some reason isn't possible in songs. This makes it very hard especially to learn how to sing lyrics, and for other reasons.
It's not even a new feature request, it's just unblocking the feature for songs. You could even make it optional in the settings.
Edit: And you don't even have to add two buttons, you can enable a long-press on the prev/next buttons!
If there is a good design reason for this choice, please explain it.
(I know this has been requested in 2017 but it wasn't implemented, and the links to past similar topics, which sometimes aren't that similar, isn't helpful for someone wishing for a new feature. In this case, not even new.)