Who was the sole constant member of Electric Light Orchestra who collaborated with Del Shannon with on the Rock On! album?
Rock On! (Del Shannon album):  is the 12th studio album by American rock singer Del Shannon, released posthumously in 1991. Jeff Lynne: Jeffrey Lynne (born 30 December 1947) is an English songwriter, composer, arranger, singer, multi-instrumentalist and record producer who gained fame in the 1970s as the lead singer and sole constant member of Electric Light Orchestra.
i don't know