Donald Fagen, Michael McDonald and Boz Scaggs, collectively known as the Dukes of September Rhythm Review, have regrouped for another go-round.

Donald Fagen, Michael McDonald and Boz Scaggs, collectively known as the Dukes of September Rhythm Review, have regrouped for another go-round.

The band is feeling freer than it did the first time it hit the road.

"If we learned anything, it's only that this time we can push the envelope a little bit more with the material," says McDonald. "In the first round, we were wondering how obscure we could get with some of the material."

Before, the Dukes of September touched on songs by the Band, the Grateful Dead and the Beach Boys, things people would most likely recognize.

But now, "we do our originals, too, bring those to the table," McDonald says. "It's kind of self-indulgent. But I think it's self-indulgent for the audience, too, in a way because there's not too many shows where you're going to see this much material that is kind of old and obscure. But our aim I think is always to pick those songs that when you hear them, people go, 'Oh man, I haven't heard that in years.' But they remember the song."

Fagen, McDonald and Scaggs will dig into their catalogs, performing selected hits as well as tributes to their influences.

They are touring with Jon Herington (guitar), Freddie Washington (bass); Shannon Forest (drums); Michael Leonhart, Walt Weiskopf and Jay Collins (horns); Jim Beard (organ); and Carolyn Leonhart and Catherine Russell (background vocals).

In compiling what would play out on stage, everything started with email, with each artist suggesting songs.

"We try to figure out just anything we think might work, with the idea it will all get boiled down to a two-hour show," McDonald says. "We go through songs that would probably be more like a four-hour show until we boil it all down. It's a great chance for us to just sit and fantasize about any songs we'd like to do."

From there, Fagen, as musical director, takes the lead.

"He puts a phantom list together and then he sends those to us and we look at them and make our comments," McDonald says.

Scaggs says one thing that's key is that what rolls out on stage reflects balance.

He might look for a song he can sing with Fagen or McDonald, suitable duets, or numbers all three can sing, with each taking a verse.

"We share a common thread of music," Scaggs says. "R&B is where I'd say we all land among our interests.

Each of the Dukes of September brings something of his own. McDonald, with that unmistakable raspy voice, is a veteran pop-soul singer who made his name with the Doobie Brothers before branching off solo. Fagen is one half of famed duo Steely Dan.

As for Scaggs, he jokes, "I'm the token Okie, so I don't know exactly what I'm doing in the mix."

McDonald chimes in on the modest Scaggs, saying, "He brings a more traditional blues and deeper R&B knowledge with his guitar playing and the songs he chooses to do. ... It's really more about what happens when we three get together. It's different for all of us than what we do normally on our own."