Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/_1001/BB50.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4030-BB50.ps) >>/Users/jc/w/tmp/Tune-4030-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/_1001/BB50.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4030-BB50.abc 142 ABC music file with the extracted tune(s)
Tune-4030-BB50.ps 6 PostScript
Tune-4030-BB50.txt 142 Plain-text file with the extracted tune(s)
Tune-4030-get.log 3946 Log file, useful mostly for debugging
Tune-40300-EliasHowe_MusiciansCompanionP3-1844-V1.abc 175 ABC music file with the extracted tune(s)
Tune-40300-EliasHowe_MusiciansCompanionP3-1844-V1.txt 175 Plain-text file with the extracted tune(s)
Tune-40300-get.log 3712 Log file, useful mostly for debugging
Tune-40309-EFDSS_CDM5.abc 147 ABC music file with the extracted tune(s)
Tune-40309-EFDSS_CDM5.pdf 2217 Portable Data Format
Tune-40309-EFDSS_CDM5.ps 6 PostScript
Tune-40309-EFDSS_CDM5.txt 147 Plain-text file with the extracted tune(s)
Tune-40309-get.log 4884 Log file, useful mostly for debugging
These files should be available for 24 hours.