This clearly won’t be a high concept film, it sounds more in the indie format. But the concept itself seems very unappealing. What about this street busker makes him good enough to think he has what it takes to present his music to a famous music manager? Is the busker an undiscovered savant in music or something? And what exactly do you mean by before it’s too late? Is the famous music manager planning on going back to Europe soon or is the street busker on the verge of death? Structuring your Logline to answer those questions will make the concept of your movie much more appealing in my opinion.