Tricky URL to try to link to. You could escape the brackets in the URL and use <a href=""> or the Monastery "in-house" brackets:

[http://people.ku.edu/~nkinners/LangList/Langs/P/PEARL%5B1%5D.htm]
yields
http://people.ku.edu/~nkinners/LangList/Langs/P/PEARL%5B1%5D.htm

But i am afraid that linking via [http://people.ku.edu/~nkinners/LangList/Langs/P/PEARL[1].htm] is not possible, not even with <a href=""> ...

But i did make a link to the page. ;)

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)