fixed interface function names, add sound functionality

libs/core/shims.d.ts

@@ -524,6 +524,18 @@ declare namespace motors {
     //% parts=dcmotor shim=motors::motorOn
     function motorOn(power: number): void;
 }
+declare namespace music {
+
+    /**
+     * Plays a tone through ``speaker`` for the given duration.
+     * @param frequency pitch of the tone to play in Hertz (Hz)
+     * @param ms tone duration in milliseconds (ms)
+     */
+    //% help=music/play-tone weight=90
+    //% blockId=device_play_note block="play|tone %note=device_note|for %duration=device_beat" icon="\uf025" blockGap=8
+    //% parts="speaker" shim=music::playTone
+    function playTone(freqency: number, ms: number): void;
+}
 declare namespace pins {
 
     /**