Grovellors are probably the most musical creatures, which exist it in the universe. Grovellors produce music when they are content. How they make those sounds is a good, yet unanswered question, but it works excellent. Since Grovellors are the most content beings in the universe, they are constantly surrounded by music. This does not only make them interesting for the Breggels, who constantly party, they are also popular with all the other inhabitants of the planet who like to see, or hear, them. Grovellors come in all different sizes. There is the miniature pocket-Grovellor, the handy general-purpose Grovellor, up to the 14-yard long concert Grovellor. Grovellors are quite easy to operate. In order to adjust the volume one gives them more or less to drink or scratches them behind the ears. In order to influence the music speed one must massage the Grovellor's back. Only a few Breggel can make the Grovellors produce up to 400 different tones by complicated massage-techniques. The best Grovellorpetter of the Breggel is by far Deejay.