Instrumental Duet Euphonium,Instrumental Duet,Tuba - Level 4 - Digital Download SKU: A0.942600 Composed by Johann Sebastian Bach. Arranged by Alejandro Guardia, Jr. Baroque. Score and parts. 8 pages. Alejandro Guardia #3042051. Published by Alejandro Guardia (A0.942600). Canon (No. 4) alla Duodecima in Contrapuncto alla Quinta From the Art of Fugue For EuphoniumTuba Duet.