99_bottles.rb

[*1..99].reverse.each do |i|
  phrase = ["#{i} bottles of beer on the wall",
           "#{i} bottles of beer",
           "You take one down",
           "You pass it around",
           "#{i - 1} bottles of beer on the wall.."].join(".. ")
  `say #{phrase}`
end

song_that_never_ends.rb

loop do
  phrase = [
    "This is the song that never ends",
    "Yes it goes on and on my friend",
    "Some people, started singing it",
    "not knowing what it was",
    "And they'll continue singing it forever just because"
  ].join('.. ')
  `say "#{phrase}"`
end