古往今来[kooukonrai] in all ages
古今[kokon] ancient and modern times
古今東西[kokontouzai] all times and places
古今無類[kokonmurui] best ever

今か今か[imakaimaka] eagerly waiting
今が今[imagaima] just now
今が今まで[imagaimamade] till just now
今しがた[imashigata] moment ago

御蔭様[okagesama] (somebody's) backing
御客様[okyakusama] guest
お子様[okosama] child (someone else's)
お生憎様[oainikusama] that's too bad (ironical)
御待ち遠様[omachidoosama] I'm sorry to have kept you waiting

御疲れ様[otsukaresama] thank you
御母様[okaasama] mother
ご苦労様[gokurousama] thank you very much for your ...
御馳走様でした[gochisousamadeshita] That was a delicious meal (said after meals)
様を見ろ[zamawomiro] serves you right!

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