Which musician was not a member of the Grateful Dead?

Who of the following is most closely associated with an altarpiece completed for the cathedral at Ghent and involving more than a dozen hinged panels?

A. Jan van Eyck B. Giotto C. Cimabue D. Claus Sluter

Buddy Holly influenced the Mersey sound with his use of a solid body electric ________.

Fill in the blank(s) with the appropriate word(s).