CD, remember that he can't use a song more than once per day. It's already established that, if he finds songs with duplicate effects, he still likes to stockpile them in his helmet if the duplication is potentially useful.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor