pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86543-20210911_PF_Belmont_Set.ps) >>/Users/jc/w/tmp/Tune-86543-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/PF/Belmont/20210911_PF_Belmont_Set.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_86543.log 551280 Log file, useful mostly for debugging
Tune-86543-20210911_PF_Belmont_Set.abc 15554 ABC music file with the extracted tune(s)
Tune-86543-20210911_PF_Belmont_Set.ps 135975 PostScript
Tune-86543-20210911_PF_Belmont_Set.txt 15554 Plain-text file with the extracted tune(s)
Tune-86543-get.log 16029 Log file, useful mostly for debugging
These files should be available for 24 hours.