Paul McCartney says his new album title derives from his interest in mischief

(CBS) Paul McCartney gives fans a taste of both his childhood and musical influences with the release today of his new album, "Kisses on the Bottom."

An interesting title, perhaps, for Sir Paul McCartney. It comes from the lyrics of the set's lead song, the 1930s Fats Waller jazz standard, "I'm Gonna Sit Right Down And Write Myself a Letter." The former Beatle told the U.K.'s Sunday Times the album title evolved from his love of "mischief."

"It's good for the soul, it's always a good idea - if only because people think it's a bad idea," McCartney, 69, said.

"Kisses on the Bottom" - McCartney's 15th solo studio release - marks his first new album in nearly five years. It features 12 covers of songs he grew up listening to in Liverpool, mostly standards, including "Bye Bye Blackbird" and "It's Only a Paper Moon."

There's also two McCartney originals: "Only Our Hearts" and "My Valentine," which was written for his new wife Nancy Shevell. The collection features guest appearances by Eric Clapton and Stevie Wonder, and was recorded with Diana Krall and her band.

And still, after all of this time, McCartney says he  has to pinch himself every now and again.

He told the U.K.'s Metro about how he recently checked out the George Harrison book accompanying Martin Scorsese's "Living in the Material World" documentary.

When he saw a photo of the Beatles, McCartney said, "It took me right back. I was like: "Was I really there, in the Beatles? Bloody hell!" It's obviously a stupid thought but I'm glad I haven't got used to it yet."

Give "Kisses on the Bottom" "a spin" here.