Igor Alexandrevich Karlin is a professional accordion player from the town of Saratov in Russia, which lies 500 km south of Moscow on the Volga.
He plays the Saratov diatonic accordion (Saratovskaya Garmonika), an accordion type developed in the second half of the 19th century in the region of Saratov.
Garmonika is the Russian name for a diatonic button accordion, a folk accordion.
In Karlin’s hands the accordion changes almost into a living being, breathing, roaring, singing. The bells on the Saratovskaya make it sound like a mixture of cajun and csardas, dipped in a notalgic Slavic sauce.
His repertoire consists of Russian dance tunes. In duet or ensemble, he accompanies Russian folk songs.
Russian folk dances: Barynya, Czardas, Drobushki, Hopak, Kadril, Kalinka, Khorovod, Kamarinskaya, Kazachok, Korobushka, Lezginka, Matanya, Polka, Semyonovna, Trepak, Tsyganochka, Troika.

The Saratovskaya Garmonika is a variant of the one row push-pull diatonic button accordion. The main distinguishing feature is that it plays the tonic scale (and major chord) on the bellows draw and the dominant on the bellows press, the reverse of a standard diatonic box.
A curious feature is the two bells on the top of the instrument. These are struck with tiny metal hammers attached to the bass and chord buttons and are used for rhythmic accompaniment on dance tunes. The basses also have an additional tonic chord button in the center, lighter in tone than the regular chord, which is not attached to the hammers.