During the "Monday Celebrity Nights", many notable guest musicians such as Roy Eldridge, Hot Lips Page, Ben Webster, Don Byas, and Lester Young would sit in. The trumpet duels between Roy Eldridge and Dizzy Gillespie became legend, with Gillespie eventually surpassing his mentor. Speaking to Al Fraser, Gillespie recalled how Thelonious Monk one night teased Eldridge after being out-played by Gillespie saying, "Look, you're supposed to be the greatest trumpet player in the world ... but that's the best." Even though Eldridge was an established musician in the older swing style, he was an active figure at Minton's and contributed through his encouragement of Gillespie and Clarke to further their explorations.