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Class variable and instance variable with the same name

class Song   include Comparable   @@plays = 0   attr_reader :name, :artist, :duration   attr_writer :duration   def initialize(name, artist, duration)     @name     = name     @artist   = artist     @duration = duration     @plays    = 0   end   def to_s     "Song: #@name--#@artist (#@duration)"   end   def play     @plays  += 1        @@plays += 1     "This  song: #@plays plays. Total #@@plays plays."   end   def record     "Recording..."   end   def inspect     self.to_s   end   def <=>(other)     self.duration <=> other.duration   end end