Okay, so imagine you are in a church and there is a book with songs in it that people sing together. That book is called a hymnal. Now, thomissøn's hymnal is a special type of hymnal. It was created by a person named Thomas Thomissøn (hence the name) a long time ago in Norway. Thomissøn's hymnal is special because it has a lot of songs that people in Norway like to sing during church or other important occasions.
It's like a big book of songs that people in Norway know and love. Some of the songs in thomissøn's hymnal are about God and Jesus, while others are about other important values like love, kindness, and helping others.
Thomissøn's hymnal is still used today in Norway, and it's an important part of their culture and history.