code:

for command to read 3 tokens from a prevdate.txt file and set 3 previous date variables
for command to read 'date /T' with / and [space] delimiter and set 3 current date variables from tokens 2-4
for command to generate series of desired hours (
  if currday > prevday (
    for command to generate days from prev to curr (
      call getshow.bat month day year hour
  ) else (
    for command to generate days from prevDay to 31 ^
      get those shows using prevMonth and prevYear
    for command to generate days from 1 to currDay ^
      get those shows using currMonth and currYear
  )
)
for command to select the mp3 files (
  for command to rename them
)
echo current month day year > prevdate.txt

getshow.bat provides leading zeroes with string manipulation to whatever its passed and uses wget to get the MP3s