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.
Top Definition. Pentatonix. An a capella group that officially began their singing career after winning Season 3 of The Sing-Off, the group consists of Scott Hoying (baritone), Kirstie Maldonado (soprano/alto), Mitch Grassi (tenor), Avi Kaplan (bass), and Kevin Olusola (beatboxing percussionist).fter winning on Season 3, the group signed a record label and was soon touring the United States. Their specialty is doing covers of popular music while adding in their own special breakdowns and futuristic musical effects, thanks to Kevin and Avi, with Scott, Kirstie, and Mitch focusing on melody and harmony.