Initially I thought it must have been an (early) Maria Friedman recording but you can briefly see the actual vocalist in the wedding scene.
Pink bathrobe because some wedding guests got into a fight beforehand, fell into the lake and he dived in to rescue one of them despite having only learnt to swim this year - hey, it's a soap. There's also mud on the hem of Linda's wedding dress.
The episode seems to rely on the broader interpretation of the song (namely that positive and negative emotions are all part of Being Alive) and one that I don't agree with, rather than either of the characters getting married having a similar narrative arc to Bobby.
But I did like them matching some of the other lines with other characters' experience.