Spotted on Instagram: a post regarding the 22nd anniversary of the Opening Night Gala at the Hollywood Bowl on June 25th, 1999 featuring George Martin conducting the Hollywood Bowl Orchestra performing the music of The Beatles with guest appearances by various rock musicians, including a reunion of The Bangles. Long-time readers recall that I had mentioned this performance in my entry regarding George Martin's passing in 2016, as Trevor noted in a Facebook post he had participated in the concert. However, in this post you can see the program listing, and Trevor's appearances are noted in the entry text, he played and sang in the second half of the program on "Sgt. Pepper's Lonely Hearts Club Band," "The Long and Winding Road," and "Golden Slumbers/Carry That Weight/The End" as well as the show's encore of "All You Need Is Love" and "Hey Jude."
https://www.instagram.com/p/CQkgaPysjGQ/
For those of us obsessive completists, someone kindly uploaded an audience recording of the show itself last year. Trevor's vocal on "The Long and Winding Road" can be heard beginning at the 1:25:40 mark, with George Martin's introduction of Trevor as "a multi-talented guy" and other kind comments. Then he reappears to sing "Golden Slumbers/Carry That Weight/The End" at the 1:35:50 mark.