This is a teacher standing in front of their blackboard. The board has a shelf on it to hold chalk or dry erase markers. The teacher has his/her mouth open wide and is teaching students how to sing. He/she has musical notes coming out of his/her open mouth.
This is the Singing icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.