Chopin

 is a Tier 5 Tank that upgrades from Engineer and Composer at level 60.

Design
looks like the Engineer but its shortest barrel is made even shorter and given a trapezoid on top of it.

Technical
The fires pillboxes like the Engineer with turrets on them that track enemies autonomously. Like other Single tanks, this tank is able to zoom its camera in a given direction by right clicking. Combined with the fact that blocks go to your mouse, this tank has substantial range and versatility.