The neo-hippie jam band Phish was a pop culture phenomenon for 21 years, known as much for its live tours and lengthy instrumentals as for its devoted fans who showed up night after night. It was often compared to the Grateful Dead, a charge that lead singer and guitarist Trey Anastasio has tried to avoid. A contributing editor to Rolling Stone magazine, Anthony DeCurtis, will interview Mr. Anastasio tonight at the 92nd Street Y.

Since the band’s breakup in 2004, Mr. Anastasio has pursued a solo career, touring and releasing two albums, most recently “Bar 17” in October. His new music, which is more radio-friendly than most Phish offerings, has polarized some fans that miss the eccentricities of his older material. Mr. DeCurtis hopes to probe Mr. Anastasio on that subject.

“People have raised a lot of issues about Trey and what he’s doing in the post-Phish life that he’s lived.” Mr. DeCurtis said in an interview yesterday with The New York Sun.

Mr. DeCurtis is curious to know whether Mr. Anastasio is as adamant as he once was that Phish would never reunite, and if the music he’s creating now is the reason the band split. “He’s had a very important opportunity to go solo. I want to get a sense of how satisfying that’s been for him,” Mr. DeCurtis said.

The 92nd Street Y hosts Mr. DeCurtis for a public interview about three times a year. He usually tries to make the interviews interesting to both fans and people who are curious, but in this case, Mr. DeCurtis doesn’t expect the audience to be completely in the dark. It’s not going to be “Trey 101,” as he put it, and it won’t be a “Phish trivia fest” either. “He’s not a cagey guy,” Mr. De-Curtis said of Mr. Anastasio. “I think that the people who show up to hear him talk about how he’s doing will find out.” Mr. Anastasio declined to be interviewed before tonight’s appearance.

Last December, Mr. Anastasio was arrested in upstate New York for driving while intoxicated and possession of narcotics without a prescription, and last Friday, a grand jury in Washington County, New York, changed the possession charge to a felony charge. Mr. DeCurtis thought the interview might be canceled, but found that on the contrary, Mr. Anastasio wanted to speak up.

“There are legal issues that he’s probably not going to be able to talk about,” Mr. DeCurtis said, “but in terms of where he is at this moment and how he’s feeling about it … he’s going to have a lot to say about that.”

Tonight, 8 p.m., 92nd Street Y, 1395 Lexington Ave. at 92nd Street, 212-415-5500, $35.