即興 (Chek-heng)演奏 (ián-chàu) (即興演奏) 是 (sī)佇 (tī)演奏音樂 (im-ga̍k)的 (ê)同時 (tông-sî)嘛 (mā)即時 (chek-sî)參與 (chham-ú)創作 (chhòng-chok)。演奏者 (Ián-chàu-chiá)會當 (ē-tàng)依據 (i-kì)抑 (ia̍h)無 (bô)依據樂譜 (ga̍k-phó͘),佇演奏的同時加入 (ka-ji̍p)家己 (ka-kī)的創意 (chhòng-ì),或者 (he̍k-chiá)透過 (thàu-kòe)和 (hām)其他 (kî-thaⁿ)演奏者互動 (hō͘-tōng)並 (pēng)即時做 (chò)出 (chhut)回應 (hôe-èng)。佇爵士樂 (chiok-sū-ga̍k)內 (lāi)非常 (hui-siông)捷 (chia̍p)khoàiⁿ。