Hello! Serenpidity is a marvellous tool in Sonic Pi! 
The cluster was at the origin a simple chord but its destiny was to become an huge cluster! I hope you’ ll like it!
live_loop :one do
with_fx :reverb, room: 0.9, mix: 0.8 do
use_synth :hollow
play chord(:E3, :m13, num_octaves: 4), release: 4, amp: 6, cutoff: rrand(30, 110)
play :e2, amp: 4
sample :loop_breakbeat, beat_stretch: 4
sleep 1
sample :ambi_choir, rpitch: (ring,-8, 1, 4, 6).tick
sample :loop_safari, pan: -1 if rand<0.56
end
sleep 4
end