The Turtles’ Mark Volman and Howard Kaylan (Steve Snowden/Getty Images)Turtles frontman Howard Kaylan says he isn’t very happy that his band’s classic hit “Happy Together” apparently was performed without permission Monday during the opening day of the Republican National Convention in Cleveland. Kaylan revealed in a Twitter post that he now is considering taking legal action over the alleged unauthorized usage of the tune.

“We never approved this use. Now we call the lawyers,” the singer wrote Monday in response to a Twitter users who tweeted, “Happy Together being played at RNC wow!!”

According to USA Today, “Happy Together” was played by a band at the beginning of the event, just after “The Star-Spangled Banner” and the Pledge of Allegiance.

Kaylan is the latest in a series of music artists, including R.E.M. and Neil Young, who have asked that Republican presidential candidate Donald Trump not to use their songs at campaign events.

“Happy Together” topped the Billboard Hot 100 in 1967, and was The Turtles only #1 hit. Kaylan and fellow founding band member Mark Volman continue to lead the group’s current lineup, which currently is headlining the latest installment of the annual Happy Together Tour. This year’s lineup also features former Three Dog Night singer Chuck Negron, Gary Puckett & the Union Gap, The Cowsills, The Spencer Davis Group and ex-Paul Revere and the Raiders frontman Mark Lindsay.

Copyright © 2016, ABC Radio. All rights reserved.