For Davies, it's a chance to squeeze back into the songs that made his name – as any man of 66 might wish to revisit an old pair of jeans.
For his guests, it's a chance to try those songs on for size and see how they fit. For the listener? It's a mixed bag, of course: Davies' presence mostly either overshadowing or interrupting the collaborative efforts of Springsteen, Bon Jovi, Mumford et al. Jackson Browne's "Waterloo Sunset" is a high point, the Amy MacDonald duet a low one. Bottom line? Time to buy a new pair of jeans.