Harmonic Songblade (and probably all other songblades) are not being added to the hit/damage of bard powers that have the Implement keyword. This may be related to the problem with Instruments not being recognized as Implements, but it could additionally be that Songblades are not being recognized as Instruments.
Fixed them... by adding the Tag ImplemType to them all... and then put Instrument for all of them.
Plus created a new implement type called Instrument and tagged the wonderous instruments.
Then added Implement proficiency to the bard class.