Ranma ½: Nettou Uta Gassen
English title: Ranma 1/2: Hot Song Contest
Japanese title: らんま１／２　熱闘歌合戦
Type: OVA
Source: Manga
Episodes: 2
Status: Finished Airing
Aired: Nov 7, 1990 to Nov 21, 1990
Duration: 25 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Kitty Film Mitaka Studio
Producers: Kitty Films
Genres: Comedy
Themes: Music

A two-part music OVA series never released outside of Japan featuring the main Ranma 1/2 characters. They appear to be having a music contest at a local TV station. As everybody knows, these characters can't get along for more than three minutes and hilarity and hijinks ensue. 

(Source: AniDB)