Kragen's Introduction 
to ByteBeat music.
The simplest beat, a tick tick tick.
You'll hear 8000/256/d ticks per second where d is the number dividing t. Typically this division is achieved by right-shifting n places with the >>n operator.
(8000 / 256) / 8 = 3.9 ticks/sec
t>>3
(8000 / 256) / 7 = 4.5 ticks/sec
t/7
Of course things get complicated and the combinations are endless.
The "forty two" melody in various forms. From Viznut's deep analysis post.
t*(42&t>>10)
t*((42&t>>10)%14)
Kragen's Crowd, the score for my Exploring Cyberspace video contribution to X-Prize.
((t<<1)^((t<<1)+(t>>7)&t>>12))| t>>(4-(1^7&(t>>19)))| t>>7