Last night, I watched.....
August Rush (2007).
It's a story about an undiscovered child music prodigy who was orphaned shortly after he was born.... and how his birth parents find him nearly 12 or 13 years later, as his conducts the New York Philharmonic Orchestra, playing his first magnum opus orchestral arrangement, during his debut appearance .....I thought it was a wonderful movie.
This isn't the movie trailer, but it's a movie clip which shows his birth dad and August dueling on guitars (where he tells his birth dad that he'd only played the guitar for only six months...)