Bass theme (on piano) throughout:
D D E F -- through first verse
D D E F (G accents) -- through second verse
D D E F (D G accents) -- rest of the way
The G accents get more prominent after the first chorus.
"But now...
Chorus:
"Weeeeeeeeeeee'll float
Take life as it comes..."
I think that Bbmaj7 is really nothing more than Dm with a Bb bass note (so Dm/Bb), but I
play it as shown below:
Bbmaj7: 6x776x