FibonacciMomentum is a pice for Sonic Pi which generates binary versions of Fibonacci numbers and uses then to control the notes being played. Further details in the comments. You can hear it on https://soundcloud.com/user-195236670/fibonaccimomentum

FibonacciMomentum.rb

#Fibonacci Momentum by Robin Newman May 2018
#This piece generates number in the Fibonacci Sequence where each new number
#is the sum of the previous two. The numbers are converted to binary
#using a recursive function and then these are then used to control the playing of two notes.
#The binary digits are read progressively from each end of the binary number.
#If the digits are the same the first note plays, if they are different the second note plays.
#The pitch of the first note is controlled by its position from the start of the number.
#The pitch of the 2nd note is controlled by its position from the end of the number.
#In each case the pitches are taken from a ring based on notes from either
#the :e2 :minor_pentatonic or :harmonic_minor scales.
#Further differences are introduced for the pan position and cutoff of each note,
#and one note has a random +/- 1 octave shift applied.
#The piece cycles through the first 50 Fibonacci numbers twice before stopping.
#A regular rhythmic drum and cymbles reinforce the relentless momentum.

use_bpm 90
use_debug false
use_cue_logging false
define :to_binary do |d| #recursive decimal to binary converter
  binary = (d % 2).to_s
  if d == 0
    return binary
  elsif d == 1
    return 1.to_s
  else
    return binary = to_binary(d/2).to_s + binary
  end
  return binary.to_i
end

use_synth :tb303

set :nminus2,0 #first two fibonnaci numbers
set :nminus1,1
set :kill,false # used for stopping the piece
set :cyclesleft,2 # sets the number of cycles

with_fx :level, amp: 0 do |v| # used to fade in and fade out the volume
  
  at [0,rt(232.4)],[2,0] do |vol| # controls fade in and fade out
    control v,amp: vol,amp_slide: 7
  end
  
  with_fx :gverb,room: 20,mix: 0.4 do #apply gverb
    
    live_loop :fibBinPlay do #generate fibonnaci numbers, then convert to binary
      #choose 2,3,6,8 notes from the scale
      scname=[:minor_pentatonic,:harmonic_minor].choose
      sc=(scale :e2,scname,num_octaves: 3).pick [2,4,8,16].choose
      if tick==0 #0 dealt with as a special case
        set :cyclesleft,get(:cyclesleft)-1
        set :nminus2,0  # set intial values for last two numbers
        set :nminus1,1
        puts  "Fibonacci number #{look} is #{look}"
        play sc[0],release:0.2,amp: 0.4
        puts"Binary 0"
        sleep 0.2
      else
        n=get(:nminus2)+get(:nminus1) #gnerate next fibonnaci number
        puts "Fibonacci number #{look} is  #{n}"
        b=to_binary(n) #convert to binary
        puts "binary #{b}"
        puts "binary length is #{b.length}"
        puts "pick #{sc.length} notes from #{scname} scale" #number of notes available for this pass
        b.length.times do |i| #travrse binary number
          #read from both ends and play pitch if digits are equal
          play sc[i]+[12,-12].choose,release: 0.2,amp: 0.2,cutoff: rrand(60,100),pan: -1 if b[i]==b[b.length-i]
          #play second pitch if digits are different
          play sc[b.length-i],release: 0.2,amp: 0.2,cutoff: rrand(60,100),pan: 1 if b[i]!=b[b.length-i]
          sleep 0.2
        end
        set :nminus2,get(:nminus1) # update minus1, minus2 for next pass
        set :nminus1,n
      end
      if look==50 and get(:cyclesleft)==0 #finish after 2 complete cycles
        set :kill,true
        puts "stopping"
        stop
      end
      tick_reset   if look==50 #after 50 passes reset to first number for nect cycle
    end #live_loop fibBinPlay
    
    
    live_loop :tb,auto_cue: false do #accompanying percussion rhtym
      sample :bd_sone,amp: 1.5 if spread(3,4).tick
      sample :drum_cymbal_closed,amp: 2 if !spread(3,4).look
      sleep 0.4
      sample :drum_cymbal_closed,amp: 1.5 if !spread(3,4).look
      sleep 0.4
      stop if get(:kill)
    end #live_loop tb
  end #fx gverb
end #fx level