Roufas - Ally has not been implemented yet - the highest faction you can currently get is Warmly; but I get your point!
I can also confirm that with an instrument (Unicorn Horn) at level 53 I was able to jump from indifferently to Kindly (min549 max749) and dubious to Indifferent (min100 max700) - so it would seem that the instrument is not adding a bonus to the base value of the song.
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[60 Virtuoso] Inyahin (Half Elf)
[55 Druid] Katerie (Wood Elf)
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