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Remember...

In order to take Amplified Rage you must have the Rage Class Feature so, as a skald, you need a dip in Bloodrager or Barbarian.

This thread is a little old, but the above quoted statement seems to be contradicted by the language of Raging Song if Rage Class Feature = Rage Class Ability.

Raging Song does identifies itself as a Rage Class Ability.

Inspired Rage (Su)

... If an ally has her own rage class ability (such as barbarian's rage, bloodrager's bloodrage, or skald's inspired rage), she may use the Strength, Constitution, and Will saving throw bonuses, as well as AC penalties, based on her own ability and level instead of those from the skald (still suffering no fatigue afterward). However, inspired rage does not allow the ally to activate abilities dependent on other rage class abilities, such as rage powers, blood casting, or bloodrager bloodlines; the ally must activate her own rage class ability in order to use these features.

Further, Bloodrage and Rage are undoubtedly Rage Class Features which are referred to above as Rage Class Abilities. It would seem that the two phrases are interchangeable.

Accordingly, unless the difference between "Rage Class Ability" and "Rage Class Feature" is more than semantics, dipping into Bloodrager should not be necessary.

At the very least, the issue is ambiguous.