The Wycliffe Handbook of Preaching & Preachers, W. Wiersbe, p. 189
When John Henry Jowett was pastor at Newcastle-on-Tyne, England, he began a series of children's meetings. At the very first meeting, four boys with penny whistles upset the meeting by playing tunes while Jowett was speaking. An usher rounded up the boys and took them to the vestry where they faced Jowett. "Can't you fellows play tin whistles any better than that?" Jowett asked. "If you can't, I shall have to get Mrs. Jowett to give you some lessons."
A few weeks later, the four boys gave a concert with Mrs. Jowett accompanying them on the piano.