Hey there!
Do you know what a song is? It's when someone sings words with a special tune or melody, right? Well, a long, long time ago, people didn't have computers, phones, TV or radios like we do now. They didn't have many ways to entertain themselves. But they still loved music, so they would sing songs in church or at home.
One day, someone had an idea to write down all the songs they knew into a special book. That way, they could remember them and teach them to others. But these weren't just any songs – they were songs about God and faith. So, they called their book "eyn geystlich gesangk buchleyn" - which means "A spiritual songbook" in old German.
The book had lots of pages filled with words and music notes. People would use it in church to sing together and praise God. They would also sing at home with their families. It was like their own special music book!
So, in summary, "eyn geystlich gesangk buchleyn" is a very old book filled with special songs about God and faith. People used it to sing together and praise God in church and at home.