This has happened quite a few times in the last several years, usually the people who are being told to stop playing music are Republicans.
Here are some:
-The band 'Dropkick Murphy's' told Scott Walker to stop using their song He used a clip of their music at the Iowa Freedom Summit
-The group Heart told Sarah Palin to stop playing 'Barracuda'
-Mellencamp told John McCain to stop playing 'Our Country' (Both of these in 2008)
-Tom Petty asked Michele Bachmann stop playing 'American Girl' at her campaign stops
-Twisted Sister told Paul Ryan to stop playing 'We're Not Gonna Take It' at his campaign events in 2012
Today, it's Neil Young
LA Times Reported:
Billionaire Donald Trump, a Republican, announced his bid for the presidency with Neil Young’s “Rockin’ in the Free World” blasting in the background, and once again a political candidate has associated himself with a rock star without the endorsement of said star..
“Donald Trump was not authorized to use ‘Rockin' in the Free World’ in his presidential candidacy announcement,” Young, 69, told the Los Angeles Times on Tuesday through his longtime manager, Elliot Roberts. “Neil Young, a Canadian citizen, is a supporter of Bernie Sanders for president of the United States of America,” referring to the U.S. senator from Vermont who is vying for the Democratic nomination in 2016.