I’ve been listening to Pet Sounds a lot lately. Maybe it’s the dreary weather; whenever I put on some Beach Boys things feel a bit sunnier. But it’s a heck of a record (as I’m sure most of you know) – one of those rarified few that’s hard to chop down entirely. It’s also fascinating that it’s one on a rather short list of pop albums that have supported its own box set. The sprawling The Pet Sounds Sessions, released in 1997, chronicles the process of the album through alternate mixes, outtakes,…