Aleatoric is music in which some element of the composition is left to chance
1) Choose six notes from the piano.
2) Then give each note a number.
3) Then roll a die to start your composition!
4) Each note should have a certain duration
1=semibreve 2=minim 3=crotchet 4=quaver 5=anything 6=rest.
Maybe you can think of other ways of creating aleatoric music? Perhaps flipping a coin, or determined by colours, or even shapes.