I'm struggling to work out how to name the second chord in the following progression from a song I am transcribing:
It's a sort of Dsus4 inversion with a b6 in the bass. My best guess is that it should be called a Dsus4/Bb or something like that, but I'm not really sure where to begin (Bbmaj13 perhaps?). It's a bit of an odd one, but the voice leading from b6>6 and 4>3 to Bm is nice.
Do you have any idea what it should be called? More generally do you have any tips for naming tricky chords like this one?