The ReverbNation Flash player assumes that the MP3 files it plays have a sample rate of 44,100 Hz. If your song sounds too fast (as if the Chipmunks performed it) or too slow (as if it were in a slow-motion replay), it probably has a sample rate higher or lower than required. Re-encode your MP3 with a sample rate of 44,100 Hz (or 44.1 kHz) and upload it again.
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