Two strains of the Americana musical river converged Wednesday at the Michigan Theater.

Big Head Todd and the Monsters and John Hiatt, co-headlining on a double bill, brought the blues, the country, the rock and the roll during a three-hour show that offered something for everyone.

Big Head Todd and the Monsters have picked up where they left off in the 1990s, when they were at the vanguard of the neo-jam-band phenomenon. Led by the guitarist Todd Park Mohr, the band on Wednesday traded in extended arrangements of their classic, blues-based material, a few newer tunes and some well-chosen covers.

Mohr is a very good guitar player and the rest of the band provided a solid foundation, giving him plenty of space to stretch out favorites like “Bittersweet” and “Broken Hearted Savior.”

A killer cover of Detroiter John Lee Hooker’s “Boom Boom” proved the emotional highlight of the 90-minute set, balancing out Mohr’s clammy, solo-acoustic reading of Robery Johnson’s “Love in Vain.”

Overall, for all of its freeform jamming, the band’s approach came across as rather stilted and, as often as not, Mohr’s solos ran out of steam a chorus or two before he eventually wrapped them up.

Hiatt, on the other hand, representing the Nashville strain of that wide musical river, was as loose as an old T-shirt and just as comfortable on stage as he worked through new and old songs with equal passion.

The result was a stronger set, marked by some of his classic material, while leaving plenty of room for his well-traveled band, which is anchored by the fine guitar player Doug Lancio.

“You’ll have to excuse me,” he said near the top of his half of the program. “I have a little heartburn from that Zingerman’s sauerkraut.”

Clearly, he had them at “Zingermans,” because from that moment, Hiatt could do no wrong with the small-ish audience of only about 700 people. New tunes from his latest album, “Dirty Jeans and Mudslide Hymns,” sat comfortably alongside classics like “Cry Love,” “Thing Called Love” and “Slow Turning.”

When you have a well of songs as Hiatt’s to keep going back to, it’s hard to go wrong. But unlike Big Head Todd and the Monsters, Hiatt seemed to be having fun the entire show, living in the moment and enjoying the chance to play his songs for an adoring audience.