Soundcloud and Spotify don't have any video.

Spotify has video for some titles, particularly pop.

Usually its like a 30 second loop vs an actual music video.

We're rapidly approaching 30 seconds as the "standard" length for pop music.

tiktokization of pop music /s

It's actually the spotifization of pop music- spotify pays per song not per minute, so artists are incentivized to make shorter songs.

I'd argue it's actually just part of a very long trend.

Compared to classical music certainly, but between the 60s and the 90s the average song length did increase again: https://www.vox.com/2014/8/18/6003271/why-are-songs-3-minute...

Almost certainly in large part due to "Stairway to Heaven" and "American Pie."

:-) Depending how they used the Music Brainz data could be – there are enough longer songs around on albums at least. (Though American Pie was actually published as a double-sided single, interesting)

While this is admittedly rather handwawy, even outside of this I have the impression that there must have been some lengthening: It feels like basically every Rock & Roll song from the 50s/early 60s mostly is around the two minute mark and very rarely even approaches three minutes. Afterwards however, three or four minutes doesn't seem that unusual to encounter, never mind those really long songs, too.

That was my reasoning.