In Europe and North America, some popular music acts also make use of the instrument. Additionally, the accordion is used in cajun, zydeco, jazz music and in both solo and orchestral performances of classical music. The piano accordion is the official city instrument of San Francisco, California. Many conservatories in Europe have classical accordion departments. The oldest name for this group of instruments is "harmonika", from the Greek "harmonikos", meaning "harmonic, musical". Today, native versions of the name "accordion" are more common. These names refer to the type of accordion patented by Cyrill Demian, which concerned "automatically coupled chords on the bass side".