Binibining Pilipinas just means Ms. Phillipines. i think the backtrack is just loud that it sometimes overpower their mics thats why you may think that theyre not singing. theyre just grateful to be the guest performers because it's a national pageant and their sponsors are no joke. the show started around almost 11pm here, i bet theyre tired but the performance level is still the best, and a lot of live viewers in the venue seeing them for the first time complimented them for great performance and many became a'tin overnight. the song is just a new version sang by sb19, and they just added the rap parts. stell made the choreo for the their dance, and they helped polish the girls dance. after the intro of the girls, they went back to sing and finish the opening perf. they also performed bazinga and slmt before the announcement of winners :D