I knew a music theory major whose major instrument was the piano. He had to practice about 2 or 3 hours per day. After a lifetime of classical piano,his reach on the guitar was fantastic. He knew where each note of a chord was,all the way up the neck on the guitar. He saw the music on the page as he was playing. These students had to compose written works in various styles,Bach,Mozart,etc. Too clean,precise, and unemotional,but then again, he did not take guitar too seriously;it was a toy to him.