[nandemo]

> Guitar hero has a mode that lets you practice pieces of a song. You can practice each segment to perfection, then play the whole song. This targeted practice should be a lot more effective and still obey the idea of what he's saying.

That's exactly what he's saying: "a violin student trying to perfect a short, tough passage in a song". Passage, not the whole piece. To practice the whole piece, you divide it in overlapping passages and master each passage. It's "boring" but it works.