哀楽[airaku] grief and pleasure
愛楽[aigyou] seeking after (Buddhist teachings, etc.)
安楽[anraku] ease
安楽死[anrakushi] euthanasia
悦楽[etsuraku] enjoyment

音楽[ongaku] music
音楽の素質[ongakunososhitsu] aptitude for music
音楽会[ongakukai] concert
音楽史[ongakushi] music history
音楽大学[ongakudaigaku] College of Music

箏柱[kotoji] bridge of a koto
箏曲[soukyoku] koto music
古箏[kosou] Guzheng (type of ancient Chinese zither)

俗箏[zokusou] modern koto (in contrast to the gagaku koto or gakuso)
楽箏[gakusou] ancient type of koto with 13 strings used in Gagaku music
箏曲家[soukyokusha] koto player