MP3 crowd is wild for that Caddy ad track

Every once in a while, a car commercial captures the collective imagination -- all because of its soundtrack. This summer, it’s Boston-based ad agency Modernista!’s sleek spot for Cadillac CTS, colloquially known as “Metal” and officially called “Accessories.”

But what happens when the song in question is performed by a musical collective that no one outside the ad industry has heard of? Pure chaos, apparently.

“Who else hasn’t searched everywhere for this song . . . now I know the name and artist, I just can’t find it, even on their website!” bemoaned one YouTube.com comment regarding the tune.

Black Iris, a seven-member-strong bicoastal collection of musicians, is the band and “Firehydrant Floods” is “that song.” And as the MP3-savvy are discovering, it is not available for download -- even on Black Iris’ own website.

“I’m absolutely surprised at the response to this track,” says Black Iris composer Justin Bailey, who may just be sitting on the next “Days Go By,” the tune tapped by Mitsubishi that launched the career of gold-selling trio Dirty Vegas.

“I’m glad to have written something that people are enjoying,” the Virginia-based engineer wrote via e-mail from his studio this week. “I had been listening to some of the dance music that’s been coming out in the last few months, and it gave me the inspiration for an original idea with my own sonic footprint on it.”

Black Iris’ Los Angeles-based co-founder, Daron Hollowell, has given Soundboard the full track this week exclusively, at latimes.com/video/?slug=gd-blackiris-wn. Next week, it will also be available on Black Iris’ website.

-- Charlie Amter