The Hidden Forest

I can't seem to find any sort of bard instruments in the Alt-P

good point, totaly forgot about basic bard instruments. i will add them to Misc merchant later tonight.

However if you complite Mensk Tabolesk quest you will get Singing Beads which acts as all instruments at once.

Also, bard class charm from GloomDeep is also all instrument modifier Spirit Gem of Companionship

ahh very nice - sorry i didn't know 'bout those first time run through.