 Complete the following phrase:  Allsup worked with entertainers such as Buddy Holly, including playing lead guitar on Its So Easy! and Lonesome Tears, as well as playing with Bob Wills  His Texas Playboys. Allsup was touring with Holly, Ritchie Valens, and J.P. The Big Bopper Richardson when he serendipitously lost a fateful coin toss with Valens for a seat on the 