Obstruent Obstruent An obstruent is a speech sound such as , , or that is formed by "obstructing" airflow. Obstruents contrast with sonorants, which have no such obstruction and so resonate. All obstruents are consonants, but sonorants include both vowels and consonants. Obstruents are subdivided into plosives (oral stops), such as , with complete occlusion of the vocal tract, often followed by a release burst; fricatives, such as , with limited closure, not stopping airflow but making it turbulent; and affricates, which begin with complete occlusion but then release into a fricative-like release, such as . Obstruents are prototypically voiceless, but
Latin Grammy Award for Best Rock Album by a Duo or Group with Vocal containing at least 51 percent of newly recorded material. It was given to duos or groups. The award was last presented at the 2009 Latin Grammy Awards, being replaced in 2010 with the Best Rock Album award. The accolade for Best Rock Album by a Duo or Group with Vocal was first presented to the Colombian group Aterciopelados at the 2nd Latin Grammy Awards in 2001 for their album "Gozo Poderoso". Mexican ensembles have received the award more times than any other nationality, though award-winning albums have also been performed by musicians originating from Chile, Colombia and Panama. Molotov and