text: Space-time correlation functions, yo, they be tools
  In the research kit of physics, breakin' the rules
  Continuous-media and many-body, that's the game
  We takin' it to the next level, ain't nothin' the same
  
  Single-particle random walks, we switchin' it up
  Space-time velocity autocorrelation, fillin' the cup
  Them correlations be stretchin', lastin' for days
  Common temporal functions, they be stuck in their ways
  
  Random-walk processes, they got a special twist
  Velocity echo, opposites attract, get the gist?
  Walkers movin' in reverse, defyin' their start
  Time-dependent regions, opposin' the chart
  
  Space-time velocity correlation, it's the key
  To studyin' cold atoms, dynamics, can't you see?
  In optical potential, them cold atoms be chill
  Micro- and nanoscales, charge transport, that's the thrill