There are many theories on the origin of the guitar. In fact, the ancient pictures, drawings, and paintings of many cultures suggest a guitar, though these are actually stringed instruments of varying types. For example, Babylonian excavations in Central Asia unearthed cave carvings dating back to 1900 B.C. that show musicians playing together. The carvings feature stringed instruments resembling guitars as well as techniques like strumming and plucking of the strings. Similar stringed instruments like the okongo or cora, are still used in parts of Africa to this day.