It's not unusual for a presidential candidate to get into difficulties with their musical soundtracks - mostly for using songs without permission.
I think Donald Trump - very much the Zeppo of this year's Republican hopefuls - has broken some sort of record, having got slapped down virtually before he left the stage announcing his - admittedly amusing - candidacy.
"Heh" Trump must have thought, "I've only just said that I intend to clutter up the 2016 race with my limited understanding and honking outrage routine, and already my email box is pinging. I wonder if this email is from a wellwisher, or a rival throwing in the towel. Let's check."
Official Statement from Neil Young:Trump sighs. He had really wanted to go with Barrett Strong's 'Money', but didn't feel America was ready to vote for a black Republican Presidential theme song.
"Donald Trump was not authorized to use "Rockin' In The Free World" in his presidential candidacy announcement. Neil Young, a Canadian citizen, is a supporter of Bernie Sanders for President of the United States of America."