Not sure if posted already but I did search.
I found this on a Russian site and while it was labeled unofficial they sound pretty legit to me.
There is no background noise at all and sound pretty high quality until you reach track 78 and some do and some don't.

There are 98 tracks plus some extras. Enjoy

P.S keep in mind that track 78 down might be repeats but most are original.
The main theme,Valentines episode With Ruth and Helga,Pigeonman flying away and more are all here in HQ with no BN.
Hey Arnold - Unofficial Soundtrack (2004) (http://www.mediafire.com/download/pb2aij5vy3ka8j0/Hey_Arnold_-_Unofficial_Soundtrack_(2004).rar)

Thanks a lot

Thanks for this link!

Thanks a lot man. The link still worked

Amazing music! Fantastic discovery. Many thanks. :D