Gexing 歌行 is a historical and robust prosodic style that flourished (not originated) in the Tang dynasty. Since ancient times, the understanding of the prosody of gexing has remained in debate, which focuses on the relationship between gexing and yuefu 乐府 (collection of ballad songs of the music bureau). The points-of-view held by all sides can be summarized as a “grand gexing” perspective (defining gexing in a broad sense) and four major “small gexing” perspectives (defining gexing in a narrow sense). The former is namely what Hu Yinglin 胡应麟 from Ming dynasty said, “gexing is a general term for seven-character ancient poems.” The first “small gexing” perspective distinguishes gexing from guti yuefu 古体乐府 (tradition yuefu); the second distinguishes it from xinti yuefu 新体乐府 (new yuefu poems with non-conventional themes); the third takes “the lyric title” as the requisite condition of gexing; and the fourth perspective adopts the criterion of “metricality” in distinguishing gexing from ancient poems. The “grand gexing” perspective is the only one that is able to reveal the core prosodic features of gexing and give specification to the intension and extension of gexing as a prosodic style.