What makes Act Three by G4 notable?

This album debuted at number one on the UK Classical Albums Chart and was well-received for its ambitious fusion of genres. It helped further popularize the classical crossover genre during the mid-2000s, influencing similar acts looking to blend pop and classical music styles. Released on November 27, 2006, 'Act Three' is G4's third studio album, following their self-titled debut in 2004 and the subsequent album 'G4: The Album' in 2005. At this point, G4 had solidified their unique niche by merging operatic elements with mainstream pop, aiming to reach a broader audience while maintaining their classical roots.