1). https://musiclab.chromeexperiments.com/Song-Maker/song/5966498271592448 2). https://musiclab.chromeexperiments.com/Song-Maker/song/4913720854052864 3). https://musiclab.chromeexperiments.com/Song-Maker/song/5481200320249856
1: wrote melody 2: added percussion 3: added a bassline
