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The EP contains the tracks Dancing The Manta Ray, Gouge Away, Monkey Gone To Heaven and Crackity Jones, which were performed live during the Pixies' recent tour.
On the tour, the Pixies have performed the Doolittle album in its entirety, selling live CDs from every show, in the form of limited edition, double-disc CD sets for the price of $25. If you're not sure you want to buy one of these, you can always check out the free EP before you make up your mind.