Add musical instruments and letters to sprite, sound, and costume libraries.

src/lib/libraries/sounds.json

@@ -1357,6 +1357,13 @@
         "rate": 11025,
         "format": ""
     },
+    {
+        "name": "Rim Beatbox",
+        "md5": "7ede1382b578d8fc32850b48d082d914.wav",
+        "sampleCount": 4960,
+        "rate": 22050,
+        "format": ""
+    },
     {
         "name": "Ripples",
         "md5": "d3c95a4ba37dcf90c8a57e8b2fd1632d.wav",
@@ -1385,6 +1392,13 @@
         "rate": 22050,
         "format": ""
     },
+    {
+        "name": "Scratching Beatbox",
+        "md5": "859249563a7b1fc0f6e92e36d1db81c7.wav",
+        "sampleCount": 11552,
+        "rate": 22050,
+        "format": ""
+    },
     {
         "name": "Scratchy Beat",
         "md5": "289dc558e076971e74dd1a0bd55719b1.wav",