Part one of the WTWF look at Paul McCartney's playing, how he came to the role of bass player in the Beatles, and his visit to Hamburg's Steinway Musichaus in 1961.      Joining us again are Joe Baiardi and Jamie Ashby, long-time skilled practitioners of the McCartney arts.       The pair discuss and demonstrate the nuances of Paul's bass playing from "Ain't She Sweet" to "From Me to You" all the way through "Help!".     Along the way many of the finer points of bass-playing in general, and Paul's style in particular are touched upon along the way.