Jon Mroz and His Bull Fiddle Four

Milwaukee-based Jon Mroz and His Bull Fiddle Four bring the electrifying spirit of post-war Chicago blues to life. Formed in the autumn of 2024 by renowned bassist and vocalist Jon Mroz, the band unites a group of seasoned musicians who share a deep reverence for one of America’s most influential musical genres.

Mroz, known for leading the Swingin' Kools in the 1990s and the early jazz band Troubadours of Rhythm today, assembled his Bull Fiddle Four to celebrate the raw energy and pioneering sound of late 1940s and early 1950s blues legends like Muddy Waters, Jimmy Rogers, and Little Walter.

The lineup features some of the Midwest’s most accomplished musicians:

• Big Al Dorn, Wisconsin’s premier harmonica talent (2025 WAMI winner!) and a protégé of blues icon Jim Liban.
• Paul Stilin, a veteran guitarist with a storied career in Milwaukee’s blues and jazz scenes.
• Tael Estremera, a multi-instrumentalist whose virtuosic piano playing adds a rich dimension to the band’s sound.
• Patrick Morrow, a powerhouse drummer of taste who has toured with roots acts across the country.

With a mission to make audiences smile, dance, and maybe even misbehave, Jon Mroz and His Bull Fiddle Four breathe new life into the blues while honoring its storied origins. Whether you’re a lifelong fan of the genre or new to its timeless rhythms, their music promises to transport you to an era when the blues first lit up America’s electric airwaves.

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