pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9523-LondonMagazine.ps) >>/Users/jc/w/tmp/Tune-9523-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/LondonMagazine.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_95239.log 569545 Log file, useful mostly for debugging
Tune-9523-LondonMagazine.abc 42123 ABC music file with the extracted tune(s)
Tune-9523-LondonMagazine.ps 267505 PostScript
Tune-9523-LondonMagazine.txt 42123 Plain-text file with the extracted tune(s)
Tune-9523-get.log 26512 Log file, useful mostly for debugging
Tune-95230-24CountryDances_1809_Cahusac_FTM-001.svg 91479 Scalable Vector Graphics format
Tune-95230-24CountryDances_1809_Cahusac_FTM-002.svg 96396 Scalable Vector Graphics format
Tune-95230-24CountryDances_1809_Cahusac_FTM-003.svg 82812 Scalable Vector Graphics format
Tune-95230-24CountryDances_1809_Cahusac_FTM-004.svg 93152 Scalable Vector Graphics format
Tune-95230-24CountryDances_1809_Cahusac_FTM.abc 12040 ABC music file with the extracted tune(s)
Tune-95230-24CountryDances_1809_Cahusac_FTM.txt 12040 Plain-text file with the extracted tune(s)
Tune-95230-get.log 20482 Log file, useful mostly for debugging
Tune-95233-get.log 4620 Log file, useful mostly for debugging
Tune-95234-get.log 7047 Log file, useful mostly for debugging
Tune-95238-get.log 4490 Log file, useful mostly for debugging
These files should be available for 24 hours.