Dainijūkkai Tenkaichi Budōkai
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
"Dainijūkkai Tenkaichi Budōkai" (第二十一回 天下一 武道会, Dainijūkkai Tenkaichi Budōkai) is a background music track (BGM) produced by Toei Animation and composed by prolific Japanese composer Shunsuke Kikuchi. The track was created for the soundtrack of the original Japanese Dragon Ball series and played during the Emperor Pilaf Saga, Tournament Saga, Red Ribbon Army Saga, General Blue Saga, Commander Red Saga, Fortuneteller Baba Saga, Tien Shinhan Saga, and King Piccolo Saga.
The track is confirmed to play during the following scenes: