Did you ever try to run to metal music or use metal to set the cadence for your indoor cycling session? Songs in 90/180 bpm are not that easy to find in general but metal is even more tricky because of the numerous changes in tempo, the intros, the breakdowns etc.
So here is a playlist that collects songs with a fairly steady tempo of roughly 90 bpms. TRVE.STUDIO 90 (Tidal | Spotify)
I recommend using them in an app like djay (requires a tidal account) and the automix feature where you can set the bpm precisely to whatever you want and then the app mixes the songs and adjusts the pitch when necessary. But of course you can also just listen to the playlist if you are ok when the tempo is sometimes not 100% accurate.
I have mixes recorded in 180, 181, 182, 184 and 194 bpm to support whatever cadence I want to use in training. I’ve stored them on my sports watch and listen to them while running or indoor cycling.
For Indoor Cycling I like to do sessions where I change between 90 and 60 rpm (standard and heavy gear/climbing). For this purpose here are few heavy heavy-gear songs in (roughly) 60 bpm you can combine with the 90 bpms to create your own K3 training: TRVE.STUDIO 60 (Tidal | Spotify)