Numerous complaints have come in about midis being corrupt after they 
were downloaded. This is in response from the Netscape FAQ:

If you are getting a corrupted, unusable file as a result of trying to
retrieve a file via ftp with Netscape Navigator, then you should make
sure that the file's extension is listed in the "Helper Applications"
section of the Netscape Preferences.  The easiest way to do this is to
select the "application/octet-stream" entry in the MIME Types list, then
add your file's extension (usually three characters, but you can specify
a longer or shorter one) to the "Extensions" field.  The extensions in
the list in that field should be separated by commas.

The reason this is necessary is that if Netscape Navigator can't find an
entry in the MIME Type table for files with the extension of the one
you're trying to download, then it will download your file in "ASCII
mode", whereby carriage returns and linefeeds in the file will be
converted to whatever's natural for your computer system -- this is
quite an unhealthy thing to do to binary files.

Another Solution:

Download the   ~all_midis.zip   file.  Chances are that your brouser will
be able to handle this!

Kerry