in house entertainment

My neighbour upstairs plays in a band and practices a lot from home. Most of the time this does not bother me – I’m not here that much, butover the last few days I have noticed. The music he plays is not too bad, sounds like original rock stuff. However, practice seems to involves playing the same line again, and again, and again. Not quite sure what level of perfection they are after, as it all sounds the same to me…at least the song does vary everyday