Some merfolk have music as an affliction as well as a gift.
Whenever you speak, you are compelled to sing loudly, and you draw out even short utterances with vocal scales or simple melodies. You cannot speak in less than a loud voice, although you may choose not to speak.
You can perform the countersong bardic performance (using Perform [sing] only) for a number of rounds per day equal to your oracle level. If you gain the bardic performance class feature, these rounds are in addition to any other bardic performance rounds you gain, but they can be used only for the countersong bardic performance. At 5th level, add command and suggestion to your list of spells known. At 10th level, add 1 to the difficulty class of saving throws against language-dependent spells you cast. At 15th level, add greater command and mass suggestion to your list of spells known.
Pathfinder Player Companion: Blood of the Sea © 2017, Paizo Inc.; Author: Amber E. Scott.