[jazzman1945]

For students the most interesting in melodica – to play in an ensemble of melodicas . Children specially love it very much! You already know that to perform the rhythm on melodica isn’t difficult. In the case of duo, the second melodica gives harmony in rhythm. Chords must be in lower case in a narrow position, it is possible to use the inversions for good voice leading.
2 melodicas
Billy Boy 2

If there is a instrument with lower register as Hammond 44 or bass melodica, then bass part is provided. 3 melodicas
https://yadi.sk/d/Kg9jeuUXxRngA