
Baltic psaltery is a family of related plucked box zithers, psalteries, historically found in the southeast vicinity of the Baltic Sea and played by the Baltic people, Baltic Finns, Volga Finns and northwestern Russians.

Gusli is the oldest East Slavic multi-string plucked instrument, belonging to the zither family, due to its strings being parallel to its resonance board. Its roots lie in Veliky Novgorod in Novgorodian Rus'. It may have a connection to the Byzantine form of the Greek kythare, which in turn derived from the ancient lyre, or might have been imported from Western and Central Europe during the Middle Ages, when the zither had immense popularity. It has its relatives in Europe and throughout the world: kantele in Finland, kannel in Estonia, kanklės in Lithuania, kokles in Latvia, Zither in Germany, citera in the Czech Republic, psalterium in France and so on... Furthermore, the kanun has been found in Arabic countries, and the autoharp, in the United States. It is also related to such ancient instruments as Chinese gu zheng, which has a thousand-year history, and its Japanese relative koto. A stringed musical instrument called guslim is listed as one of the Me in ancient Sumer.

Kanklės is a Lithuanian plucked string instrument (chordophone) belonging to the Baltic box zither family known as the Baltic psaltery, along with the Latvian kokles, Estonian kannel, Finnish kantele, and Russian gusli.

Kannel is an Estonian plucked string instrument (chordophone) belonging to the Baltic box zither family known as the Baltic psaltery along with Finnish kantele, Latvian kokles, Lithuanian kanklės, and Russian gusli. The Estonian kannel has a variety of traditional tunings. In Estonia, studying the kannel has made a resurgence after some years of decline.

A kantele or kannel is a traditional Finnish and Karelian plucked string instrument (chordophone) belonging to the south east Baltic box zither family known as the Baltic psaltery along with Estonian kannel, Latvian kokles, Lithuanian kanklės and Russian gusli.

Kokle or historically kokles (kūkles) is a Latvian plucked string instrument (chordophone) belonging to the Baltic box zither family known as the Baltic psaltery along with Lithuanian kanklės, Estonian kannel, Finnish kantele, and Russian gusli. The first possible kokles related archaeological findings in the territory of modern Latvia are from the 13th century, while the first reliable written information about kokles playing comes from the beginning of the 17th century. The first known kokles tune was notated in 1891, but the first kokles recordings into gramophone records and movies were made in 1930s. Both kokles and kokles playing are included in the Latvian Culture Canon.

Krez is an Udmurt string instrument (chordophone) similar to the Russian gusli. The mythical origin of the krez is detailed in the Udmurt national epic, the Dokjavyl. The krez was used to accompany some shamanic ritual dances, and the large krez was used for music during the holiday of Bulda.