Sorry, Ivan, afraid I'm going to be the nasty in this thread. I've run through the series you posted on your blog, and I see two that have enough story mixed with ambiguity to make them street photographs. The others are pictures of people on a street. Which is not to say that the series isn't an interesting documentary on the Fete de la Musique.
To try to illustrate what I mean, I'm going to refer you to Seamus's "Galway Street" post. Keep in mind that my evaluation is based strictly on my not-at-all-humble opinion, and, as usual, other opinions may vary.
Seamus included four pictures in his post. Technically, all four are superb. The range of tones fills the expanse available on a well-calibrated LCD monitor, and nothing's left out among the mid tones.
#1 is a fine shot. Here's an interesting looking guy carrying his bike. But that's all I see. It's a great picture, but in my estimation it doesn't make it as a street shot. I don't see a story, and there's no ambiguity. The guy's just carrying a bike. If more of his surroundings were included there might be a story, depending on what's there, but he stands alone -- a guy in the street. This is documentation, but not street photography.
#2 is different. Why is the kid touching the statue's leg? Is he (she?) just checking to see what the material feels like, or is there something on the leg that he's examining. the arrangement of the statues with the kid located a third of the way in from the left and his face a third of the way up from the bottom is classic composition (oh those damned rules again). In my estimation the picture just makes it over the edge into street photography country.
#3 essentially is two guys sitting on a street bench, shooting the breeze. Actually, there are three scenes in this picture. The two kids stage left, the two guys in the middle, and the woman stage right and high. It almost makes it as street photography because of the posture and expression on the guy in the exact middle. It's a very fine shot, but weak as a street photograph.
#4. Bingo! Wow. What's that guy doing? Did he draw the mural? Is he vandalizing the mural? What's the relationship between the guy and the mural? The scene shades into oblivion in the dark left, but the darkness makes the subdued part of the mural seem ominous. This is street photography in spades. As HCB pointed out, it's all luck, but you have to prepare yourself for the luck and be ready.
Hope I haven't insulted anyone, but that's my take. I've loved good street photography since at least the mid fifties, and for anyone really interested in the subject I've posted an annotated bibliography at http://www.russ-lewis.com/Bib/Bib.html
. The bibliography isn't confined to street, but street is heavily represented. There also are two articles I wrote last year on street photography. I couldn't find a taker, and finally posted them for links like this: http://www.externalconnections.info/Articles/OnStreetPhotography.html
, and http://www.externalconnections.info/Articles/WhyDoStreetPhotography.html