how do i find the information to compare and contrast the music from the movies

2 answers

It might help to know which movies you are considering.
http://www.jiskha.com/display.cgi?id=1275313285

My best suggestion is to listen to the soundtracks several/many times and take notes:
http://www.google.com/search?q=%22parent+trap%22+music&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGLL_en___US379
and
http://www.google.com/search?hl=en&client=firefox-a&hs=CbT&rlz=1R1GGLL_en___US379&q=%22sound+of+music%22+music&aq=f&aqi=g-c1g2g-c2g4g-c1&aql=&oq=&gs_rfai=