Progeria, also known as Hutchinson-Gilford progeria syndrome (HGPS), is a rare genetic condition that causes a child's body to age fast.Most kids with progeria do not live past the age of 13. The disease affects both sexes and all races equally.rogeria, also known as Hutchinson-Gilford progeria syndrome (HGPS), is a rare genetic condition that causes a child's body to age fast.
Pentatonix is made up of Avi Kaplan, a most distinctive bass; Kevin Olusola, the vocal percussionist or the beatboxer; Kirstie Maldonado, the mezzo soprano and only girl in the line-up; Mitch Grassi who does both tenor and counter-tenor voices; and Scott Hoying, the baritone who sings lead most of the time.
Soundtrack | Actor. Pentatonix is an acapella group that won The Sing-Off (2009). They have released PTX Vol. 1 and PTX Vol. 2, along with PTXmas (Deluxe Edition). The group consists of the trio (Mitch Grassi, Scott Hoying and Kirstin Maldonado), the rhythm of the group comes from Avi Kaplan (Bass and overtone) and Kevin Olusola (Cello beat boxer extraordinaire... See full bio Â».