This musical phenomenon called Tangoman — is it a person, a band or a trip? Yes, yes and yes.

Singer Jorge Heilpern, who impels from the keyboard, insinuates vocals in the Latino tradition of Julio Iglesius and Charles Aznavour and writes all his songs and band arrangements, has undergone a multitude of changes since he’s “come out” as a professional musician. In the course of his metamorphosis from Argentinian economist to matinee idol, the excitement in his work gears higher and higher.

Disengaging himself from the first Woodstock band he sang with, where his steamy Latin ballads were overwhelming by a quartet of samurai drummers, Heilpern launched himself as Tangoman. Sometimes he works with a cabaret trio, singing in an intimate down-your-bodice style in a voice urgent with emotion, and sometimes he keeps company with a Latin jazz band, too hot to contain in a club room. They need Roseland or the old Copa, but Saturday night, the band played the Bearsville Theater. It’s a venue ideal for a group that’s great to dance to and great to hear, with elevated seating that lets folk watch if they want and a dance floor big enough for those so moved to strut.

The first time Tangoman played Bearsville, their sound seemed improvised. A double set had great solo moments from the players — Paul Branin, sax; Artie Dixon, drums; Ernie Colon, percussion; and Paul Duffy, keys, with Heilpern roistering between the keyboard and a song mike and playing acoustic guitar, and Steve Rust playing bass — but the ensemble was loose.

This time out, the fusion was fine, with the freedom, the excellence of the musicians distilled into the whole band sound — professional but flying on wild side. Only a dead man could keep off the dance floor.

Heilpern’s style has changed too — but not his substance. Gone is the ginchy style, the stalking gawky star. He’s cool; he’s wrapped his face in aviator glasses, planted himself on the mike or at the board and when he reaches out, he’s elegant, exciting, insidious.

One of the songs, “Impossible,” begins as a ballad and takes off on a ride, with a driving Latin rhythm propelled by Heilpern — let the drummers catch him if they can. It’s number one in this week’s hit parade of my mind — can’t get rid of that tune.