She officially rejoined this year after retiring in 1998, and they're currently touring the world under the banner On With The Show. But Buckingham, who admits to initial doubts over her return, has given his strongest hint yet that Mac are considering winding down - and he's putting solo plans on hold until the completion of their first record since 2003.

He tells PBS: "If you want to think of this as the beginning of the last act, that's how it feels. Christine really fills the gap of the polarity that might exist otherwise, and helps things breathe.