Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Thompson_FCCD_1800-V2.abc/1800" 
<head>
404 Not Found</title>
<body>
Not Found</h1>
The requested URL /~jc/music/book/DftY/Thompson_FCCD_1800-V2.abc/1800 was not found on this server.</p>
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[get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Tune-44272-1800.abc 163 ABC music file with the extracted tune(s)
Tune-44272-1800.txt 163 Plain-text file with the extracted tune(s)
Tune-44272-get.log 9110 Log file, useful mostly for debugging
These files should be available for 24 hours.