HELP ME OUT GIRLS? WHICH SONG IS THIS?!?

The melody is almost like titanic my heart will go on, hmm-hmmm-hmmm-haa-haaa-haaaa-hmmm-hmmmm-… daaaaa. THATS PROBABLY VERY IDIOTIC but my fiance and my sister tried it and it works! Well we still dont know the song, please dont insult me im being clever! THanks! and a piece of the lyrics i remember from it is almost like, who will say where the heart is, where the.....hmm hmmmm, doo dooo daaaaaa. yeah :) thanks!