I have to help arrange the Beatles "all you need is love" to accompany one of the choirs at school. I was just wondering if anyone had some suggestions on the instrumentation that is used in this piece?

Particularly I`m trying to decide what the instrument it that has the real "wah" part after he sings "all you need is love" *wah wah wah wah wah*. That make sense???

Anyway, any help appreciated!

Cheers