After 13 years in the Hub, singer, multi-instrumentalist and composer Abraham Gomez-Delgado has noticed that many more people now stay put at his shows.

``I've had people who are very much traditionalists in Latin music say it's wrong and leave the room,'' said the Cambridge resident and native of Puerto Rico. ``But I find that less and less now.''

Credit Gomez-Delgado and his pals in the city's avant-Latin rock community for that.

``It's been building up for the last 10 years,'' he said about that scene. ``I have a good feeling about it now. It's exciting.''

His band, Zemog, El Gallo Bueno (``Gomez'' spelled backwards, plus ``The Good Rooster''), and its predecessor, Jayuya, have had a lot to do with keeping audiences in the house. So do friends from Boston's free jazz scene and others from such bands as Babaloo and Kilombo Mambo.

A number of friends joined Gomez-Delgado on his new CD, ``Zemog, El Gallo Bueno'' (Aagoo), and will help reprise it tomorrow at Johnny D's. From the jazz world come Timo Shanko and Taylor Ho-Bynum; from the Latin side, Gian Carlo Buscaglia, Santiago Greco, Jose Ayala, Jim Messbauer and others.

``We're all real good friends and all play in each other's groups,'' said Gomez-Delgado, who met several of them when he attended the Museum of Fine Arts' Museum School.

Don't expect to hear covers of music by Eddie Palmieri, Larry Harlow or the Buena Vista Social Club when Zemog takes the stage. Conjure up something a lot rawer that manages to maintain a Latin beat as it hurtles through heavy metal, Afrobeat and even hip-hop.

None of which is surprising coming from a guy whose father was a violinist who played Peruvian folk music, whose sisters brought home disco and salsa records and whose brother turned him on to his first pop band - Kraftwerk.

``After a while, I had to make it all work together,'' he said. ``That's what my music is about.''

Gomez-Delgado recalls how the even more rockish Latin sound of Jayuya may have been ahead of its time in Boston back in the early '90s.

``It was much more aggressive and abrasive,'' he said. ``World music was just catching on then.

``I find that a lot of world music tries to mesh different cultures together and is very pretentious and not very real. I try to steer clear of things I don't know anything about. I want to combine the philosophies of both rock and Latin music, and the arrangements. It's more of a subtle mix, not this on top of this, but this completely mixed on all levels.

``Lot of people still don't know what to think of it. I love it when people get really angry at my music as much as when they really love it. Even if you don't know anything about where I'm coming from, hopefully my music at least comes across as honest.''

Zemog, at Johnny D's in Somerville, tomorrow at 9 p.m. Call 617-776-2004 after noon.