20. Correct on Keith Butcher. Not quite Busch but Busch + er = Butcher. I'll get my coat.
34. Correct again, Michael Lowe. Swing low, sweet chariot., coming for to carry me home. And Lo, a star appeared in the East. Keeps low rather than going up.
44. Ling is part-correct but something needs to be added (a task) to get the referee I was thinking of.