Głośnik and other 84,100 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
It's a rectangle with 2 circles in it with another circle like image with it. On the outside of the two circles there are 4 dots in each corner of the rectangle. As you get closer to the circles, they both overlap each other basically right next to each other. In that are forming a bunch of dots all around the circumference of the circle. This is where the inner most circle is where the "music" comes from.