I'm sad Sennheiser seem to have largely dropped the Momentum line, aside from some wireless variants - the original 1.0 on-ears were stylish with quite a satisfying, if a little flawed, signature and nothing else has the bass rumble in in quite the way they do - would love an updated version which fixed (if it is possible) the audio flaws while improving the comfort a little and keeping that bass.
Have to say I'm really struggling these days with using anything other than in-ears/earbuds for anything other than short listening sessions though - especially the HD600s just sit so heavily on my head, wearing glasses doesn't help there either, even the portable Sony MDRs I have after a couple of hours feel uncomfortable.
Not my taste in music but definitely some good tunes in there for giving speakers/headphones a good workout. A few in there I've got in my speaker test playlist like Hotel California.
Playlist I use for testing (though I have most of them in higher quality than Spotify):
Not necessarily my tastes but test for variety of different things.