凱歌[gaika] victory song
凱旋[gaisen] triumphal return
凱旋軍[gaisengun] returning victorious army
凱旋門[gaisenmon] arch of triumph

凱風[gaifuu] southerly wind
凱旋将軍[gaisenshougun] triumphant general
凱旋公演[gaisenkouen] performance given after a successful tour abroad

哀歌[aika] lament (song)
愛唱歌[aishouka] (one's) favourite song
詠歌[eika] poem (esp. tanka)
艶歌[enka] enka
応援歌[ouenka] rooters' song

歌い合う[utaiau] to sing responsively
歌い上げる[utaiageru] to sing at the top of one's voice
歌詠み[utayomi] tanka composer
歌会[utakai] poetry party or competition