A map of the Electoral Palatinate (Mannheim is #2) along the Rhine River and its coat of arms. If the shield reminds you of that of Bavaria, that is well, for the Kurpfalz was traditionally ruled by a branch of the same Wittelsbach family that ruled Bavaria.
For this post, I will highlight four composers from this German state. We start with Johann Stamitz (+1757), father of a couple of other composers, and a rather influential member of this musical school. This is the first movement of an orchestral trio in C minor, Opus 4, N. 3.
Now, from his son Karl Stamitz (+1801), a Concerto in D major that gives a good example of the "Mannheim Rocket," I think, which is the bold and immediate "rocketing" into the theme of the work.
Next, Christian Cannabich (+1798), a personal favorite of mine, and a man renowned in his time for his ability as a conductor, as well. Here is his Symphony No. 63 in D major -- though I do prefer his minor key works. The fellow pictured is Charles Theodore, Elector Palatine and Duke of Bavaria (+1799), Cannabich's patron:
Finally, Franz Xaver Richter (+1789), and Symphony No. 59 in B Flat Major to round out the group: