"Many musicians and artists work in Istanbul in the streets."

Translation: Isztambulban az utcákon sok zenész és művész dolgozik.

[JanTatouse]

What about utcákban? Is that really wrong?

[Presetview]

Yes, utcákban is wrong. Utcákon is the right way to say this, but anyone would understand you if you said utcákban instead.

[JanTatouse]

Okay, thank you!

[vvsey]

Utcában, utcákban - are used more when talking about specific streets.
"Ebben az utcában sok zenész dolgozik."