With the departure of Isobel Campbell and a turn towards straight-forward power pop, Belle and Sebstian morphed into a new band earlier in the decade. This was not a totally unwelcome development, as the genre is desperately in need of a savior and the band’s “Dear Catastrophe Waitress” and “The Life Pursuit” were two of the best releases in recent years. And, yet, we lost a delightfully idiosyncratic voice in the old B&S. Matador Records reminds of of what was lost in their recent releases of Belle’s sloppy seconds (to paint a vulgar picture).

2006’s sprawling collection of odds and sods, “Push Barman To Open Old Wounds,” consisted of more highlights than some of the band’s official LPs and paved the way for their new collection of BBC sessions. Most bands take advantage of the Beeb’s generous compensation package to pad their numbers and add back-up session players. Belle and Sebastian, already known for the expansive sound of their rock-n-roll chamber music choose an oddly pared down sound on these tracks, as if to prove they could take their music out of the studio and on the road. The collection includes four songs from 2001 that mark the transition from their earlier twee period to the later power pop years. Alas, they are no great revelation.

“The BBC Sessions” comes packaged as a two-disc set, although a sticker on the cover warns that the second disc, a live Belfast concert recording from 2001, is a “limited edition.” In front of a live audience, the band seems to come alive in ways John Peel could only dream of. You’d feel pretty good too if you could get a stadium of fans to sing along about “a girl next door who’s famous for showing her chest.” Covers include the Beatles, Velvet Underground and local heroes Thin Lizzy, whose “The Boys Are Back In Town” is a clear highlight, but in Belfast that’s a bit like singing the “Star Spangled Banner” and being surprised that people stand and remove their caps.