Idea of Tune Icon
This logo is three horizontal lines spaced evenly from each other. On each of the lines is a small rounded rectangle, taller than it is wide. The top and bottom rectangles are a third of the way from the left, and the middle rectangle is spaced a third of the way from the right.
This page shows the different variations of the Tune from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.