The CHILDREN MEDIEVAL BAND — a trio of pre-teen siblings with a combined age of 23 that took YouTube by storm with their cover version of RAMMSTEIN‘s “Sonne” (with more than 2.5 million views so far) — got to open for RAMMSTEIN themselves this past Sunday, May 20 at at the Denver Coliseum. The kids ended up performing two songs — “Ich Will” and “Sonne” — in front of 10,000 enthusastic and supportive RAMMSTEIN fans. Video footage of their appearance can be seen below.

CHILDREN MEDIEVAL BAND drummer Cornelia, who can be seen beating down the skins with a maraca and a modified drum stick, is only 5 years old. Older brother Stefan, who plays guitar and violin, is 10, and keyboardist Olga is 8. The children improved their musicianship by using the EarPower software.

Original video that went viral: