I am sure there's more to it than that - Solomon Levy was a real person and there were good reasons why he might have inspired an anonymously improvised song.

More on the Glastonbury event;

http://www.nme.com/news/watch-glastonbury-silent-disco-crowd-chant-oh-jeremy-corbyn-to-white-stripes-2091967

There are disgusted responses in the Spectator and the Telegraph as you might expect; it looks like it did the trick like a good political chant should. If it ends up doing for Theresa May what Lilliburlero did for James VII&II, nobody's going to complain it was a bit dull.