These videos (and more!) were posted on You Tube by Byron Garcia, a security consultant for prisons in the Philippines. This is what he says about the prisoners dancing:
 
This is a tribute to all Prison facilities in the Philippines (8 and counting) who are now adopting this non-violent approach to rehabilitation! Thank you, inmates deserve a second chance! If we make prisons a living hell for them, then we might just be sending out devils once they are released. Cruel methods to achieve discipline are a thing of the past! So, keep on dancing!”
A great article about them was written last year in the NY Times.