godan verb (-u)
sing a tune; sing a song
Often implies singing a short piece or a single verse, not necessarily a full song. The phrase 一節 (ひとふし) literally means 'one verse' or 'a tune'.
彼は宴会で一節歌った。
He sang a tune at the banquet.
お気に入りの歌を一節歌ってください。
Please sing a verse of your favorite song.