Sounds alot like me too .. i tend to "binge" on music books .. use it halfway and move on .. hai .. when will i be disciplined to sit down and dig in it man ..
actually i wouldnt like to think that they're slack ro what lah..maybe its like they learn halfway..then realise "oh, there's nothin to learn liao, i already know all this...so easy" hahaha
actually not true you know .. for me .. i learn halfway then i'll be distracted to cover other stuff . .i don't really sit down and learn until i got it nailed down .. that's the problem with me ..