Pete Townshend has apologized for mouthing an expletive last month during The Who's show in Hamilton, Ontario.

He became irritated with an audience member for having his seven-year-old daughter wave a sign that read, “Smash your guitar, Pete.” Townshend asked them to put the sign down and then said, "Don't bring your children [into this]. [Don't] use them." He then told the dad, Eric Costello, he couldn't say what he wanted because Costello had his daughter there, so instead he mouthed, "F-off." Of course this made news in Canada, which has led Townshend to write a letter to Costello apologizing for his actions. It read, “Apologies and condolences from my side, and very best wishes to you and your family,” and asked if they could "meet and be friends and put this behind us.”

The Who wrapped up the North American leg of their Quadrophenia tour earlier this week in Providence, Rhode Island, but before heading back to England, they did a benefit Thursday night in New York for Teen Cancer America and the Memorial Sloan-Kettering cancer hospital in New York. Elvis Costello opened the show, and his last song was "Substitute," which he asked Townshend if he could do, a gesture that Townshend thought was very nice. The Who's 10-song set included "Who Are You," "Behind Blue Eyes," "Pinball Wizard," "5:15," "You Better You Bet," "Baba O’Reilly" and the show closer, "Won’t Get Fooled Again." They'll resume the Quadrophenia tour in the U.K. in June.