所有的电影、电视、卡通的插曲都统称 OST，原文是 Original SoundTrack，这其中也包括片头曲、片尾曲、主题曲等等。

你上网查找电影原声带的时候，经常会看到（OST）的字样，就是影片音乐的意思，就是你要找的 “插曲” 了。

比如：The Virgin Suicides (OST) [Soundtrack]

英文字典解释如下：

OST: original soundtrack. A collection of music found in a particular video game, anime, movie, TV series, etc. Often referred to as a "music score" or simply a "soundtrack" in the U.S. For some reason, Japanese companies love adding on the word "original." In katakana, it is spelled "ORIJINARU SAUNDOTORAKKU." However, many Japanese will truncate that second word to "SAUNDOTORA."

ED、OP 这些简称都是日本人发明的。在欧美，很少有人这样用，大多都是写全称：

片头曲：Opening Score

片头歌：Opening Song

片尾曲：Ending Score

片尾歌：Ending Song