Original sentence: It gains its difficulty due to quick changes between chords, single notes, and tapping notes, giving the player little time to rest.Some of the more difficult songs in expert mode include: I'm For You, Procrastinating, Sleepwalkers, Something Beautiful, and Foreverandever etc.Songs in Guitar Praise have four levels of difficulty ranging from beginner to expert, like the popular Guitar Hero Series.The most challenging song in expert mode is Rock of Ages, by Paul Baloche