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Most Klein Four fans came to know of the group through an internet performance of our first song, "Finite Simple Group (of Order Two)." But Klein Four is so much more, and our debut album "Musical Fruitcake" shows why. You ain't seen nothing yet. Are they love songs about math, or mathematical songs about love? You decide. Through ten Klein Four originals and four parodies, the boys from Northwestern weave back and forth between classic rock, funk, R&B, and even western styles of music - all a cappella, and all guaranteed to make you forget you're listening to mathematics. "Musical Fruitcake" has something for everyone, mathematician and nonmathematician alike. Pass it around, but you just can't pass it up!