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You can call up a list of all the songs with a specific word in their title, album name, or artist attribution just by clicking the Source pane’s Music icon (under Library) and typing a few letters into the Search box in iTunes’ upper-right corner. With each letter you type, iTunes shortens the list of songs it displays, showing you only tracks that match what you type.
For example, typing train brings up a list of everything in your music collection that has the word “train” somewhere in the song’s information—maybe the song’s title (“Mystery Train”), the band name (Wire Train), or the Steve Earle album (Train A Comin’). Click the other Library icons, like Movies or Audiobooks, to comb those collections for titles that match a search term.