This is the first time I'm playing a tune on my new "Octo Harmonizer" made by TeleTunes (https://www.etsy.com/de/listing/1859180425/octo-harmonizer-c-dur-tonleiter) and I chose the German song "Der Mond ist aufgegangen". The lyrics are by Matthias Claudius and the tune is by Johann Abraham Peter Schulz.