Hands down Google Search is considered the very best. Surely it is the fastest search engine available. Often you get results before you are even finished asking the question. Amazing!
BTW, I like playing with searches. On my Windows 7 gear I click on the START button (usually located at the lower left hand corner) and type in *.NOT and lo, a get a directory of all of my notation music files. Also, it is clickable.
There are many other such searches applicable to Notation Composer and more.