In a review of Green Day's album "American Idiot," Rolling Stone magazine wrote, "Armstrong's vocals are as strong as ever, soaring and pleading with an urgency that recalls the best of punk's past." The New York Times wrote of Armstrong, "His voice, which can be alternately raw and soaring, is one of the most distinctive in punk."
Armstrong's vocal range is classified as tenor. He has a wide range of vocal techniques, including belting, falsetto, and screaming. He is also known for his use of vocal distortion, which he creates by using a variety of effects pedals.
Some critics have argued that Armstrong's voice can be too nasal or whiny at times. However, his unique vocal style is an essential part of Green Day's sound. He is one of the most influential vocalists in punk rock history, and his voice has helped to define the genre.