抒发 takes emotion-class objects almost exclusively:
感情,
情感,
情怀,
思念,
不满,
心声. It's the verb literary critics use about poets and lyricists, and the verb you yourself would reach for when describing art that 'expresses' something inward. Compare
表达 (biǎodá) —
表达 is general 'express' (an idea, an opinion),
抒发 specifically means letting an emotion out.