The following script will download a sequence of numbered files.
for x in `seq -w 60 181`
So in this case it will download DGW-060.mp3, DGW-061.mp3 … DGW-181.mp3.
Getting the script to loop through a sequence of numbers was tricky until I found the seq command. The -w parameter will pad the numbers with zeros so they all have the same number of digits.