Xylophone Duet Xylophone - Level 2 - Digital Download SKU: A0.1036996 Composed by Bela Bartok. Arranged by Nick Michael Lacanski. 20th Century,Instructional. 4 pages. Theupperstaff #641972. Published by theupperstaff (A0.1036996). A Swim in the River is from Bartokās collection, For Children, which was composed for piano. It is based on a Slovakian folksong. Besides being a great teaching piece for the instrumentalist, it is just as valuable for study from a compositional point of view. Thank you for looking.