I love the little arabi knob on the base. Tim, how did you make the base of the horn?
I started with two pieces about 2 X 2 X 10, set the Miter saw for 30 degs and made one cut, then back to 90 and made another, repeat until you have 6 of each. The marks are where I tried to keep the grain straight. Then make pairs and glue them up, once they are set you can either glue 3 pairs together to make a semicircle or glue two sets of pairs to make 3 sets of 4. Easier to make the semicircles, if you need to do any sanding to get them to fit, they can be a little bit off.
Next take a Spade or Forstner bit and drill out a hole so you can mount it on a 4 Jaw chuck, You could just turn it between centers if you want. Turn one end down to fit the horn and shape the rest as you like.
This method is using end grain if you wanted you could make the cylinder with parallel grain and be able to turn the Button out of the same piece.
I hope this makes sense, just ask if it doesn't and I will try and clear it up.
Glued up as groups of three;
Pushed together but not glued;
If you want more or less segments divide 360 by the number you want and that will give you your angle. On this one there are 12 segments so 360 divided by 12 give the 30degree angle. There are other ways but this is the simplest.
Tim