Harmony training
To learn harmony, you can attend face-to-face classes or online classes. For face-to-face classes, which are an older way of conducting training courses, you should look for a reputable educational institution or music academy near your place. The venue of these classes must be close to where you live, otherwise, the travel expenses or the time required for it will be added, which can be problematic for the continuation of the class. Unfortunately, the problem with face-to-face classes is that harmony classes are rare classes that may not be found in some small towns, and as a result, you may be denied training or have to travel long distances. You may also not be able to find the right professor because you don't have a wide selection. Participating in face-to-face classes requires an open schedule with a lot of free time, which many of us may not be able to attend. Also, most of them are held in public and if you want to participate in private classes, you will have to pay more. But there is a more effective way to teach this complex subject.
Music in Frankfurt
The city of Frankfurt is no less than other German cities in this field. There is one of the largest musical instrument makers' associations in the world in this city. The Frankfurter Musikpreis has been awarded since 1982 by the Musikmesse Frankfurt Foundation and the German National Association of Musical Instrument Manufacturers. The purpose of this International Music Award is to highlight "personalities from the world of music for outstanding achievements in the fields of interpretation, composition, musicology, education, and services to the production of music" (as described). This award is given annually and alternately to personalities from the world of music in the fields of popular music and classical music. Other major bands and singers in the city include ASP (Metal), Böhse Onkelz (Rock), La Bouche (Electronic Dance Music), Culture Beat, First Base, and Habakuk.