I wondered the same about the vocals. The original does have vocals, but I still am not sure whether the original "wah wah waaah" part is a vocal or not:
https://www.youtube.com/watch?v=fzw34HKjfjU

Wikipedia seems to indicate it is a vocal:
The music is complex and features soprano recorder, drums, bass ocarina, chimes, electric guitar, trumpets, whistling, and lyrics sung by a choir including simple words like "wah wah wah", "go go go eh go", "who who who", etc.