Yes it’s from the first Toronto, and yes many songs there were from Yerachmiel Begun (at age 16-17), but not this one. Vahavioisim was composed by “Shlomo Zolty”.
BTW – It seems from the Toronto recording that there’s a third high part. Part of the choir sings the first part while other sing the high, therefore people took it to mean that it isn’t a third part but just a harmony, but I belive it was just because kids cannot go so high, and those that did, did so on “falsetto” voice…