While the four solo artists formerly known as the Beatles did not equal their illustrious previous decade, they did all show chart success in the Seventies.    Eleven total number ones.     This week we start our next multi-part series (hey, two counts as "multi") covering those chart toppers.    We partially go the Paul McCartney route ("we play the hits"), but also look back at how these songs were viewed in "real time".     Lots of news, and plenty of archival clips from Casey's coast to coast!