public class BPM
{
   // global variables
   static dur wholeNote, halfNote, quarterNote, eighthNote, sixteenthNote, thirtysecondNote;
   
   // gets a random key for the song to be played in
   static int randomKeyNum;
   
   // gets a random tempo for the song.
   static float randomBpm;
   Math.random2f(80.0, 150.0) => randomBpm;
   
   static float beatsPerMin;
   90.0 => beatsPerMin;
   
   tempo(beatsPerMin);
      
   
   fun void tempo(float beat) {
       // beat argument is BPM, example 120 beats per minute
       60.0/(beat) => float SPB; // seconds per beat 
       SPB :: second => quarterNote;
       quarterNote*2.0 => halfNote;
       quarterNote*4.0 => wholeNote;
       quarterNote*0.5 => eighthNote;
       eighthNote*0.5 => sixteenthNote; 
       sixteenthNote*0.5 => thirtysecondNote;
    }
    
    fun dur getVerseLength() {
        return wholeNote*16;
    }
    
    fun dur getChorusLength() {
        return wholeNote*8;
    }
    
}