Got mine for 1 mil, but price is rising already. Might want to plan ahead to get one.
Using this Vs. using a Melody +1 is much better. The added singing skill pushes my Minuet up by 1, Minne up by 2, & unknown boosts to songs like March & Madrigal.
A +1 point boost to all enhancing songs is proof enough that it's well worth it.
I find equal or better ability to sleep adds with it also. So if you go by the unproven methodology of 2CHR = 1 Singing Skill, then that's ~+6CHR on an earring. Very useful.