pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-21489-Hokpers_vals_2-Dm,2V-64-4.ps) >>/Users/jc/w/tmp/Tune-21489-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/session/waltz/Hokpers_vals_2-Dm,2V-64-4.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-21489-Hokpers_vals_2-Dm,2V-64-4.abc 1251 ABC music file with the extracted tune(s)
Tune-21489-Hokpers_vals_2-Dm,2V-64-4.ps 42354 PostScript
Tune-21489-Hokpers_vals_2-Dm,2V-64-4.txt 1251 Plain-text file with the extracted tune(s)
Tune-21489-get.log 7985 Log file, useful mostly for debugging
These files should be available for 24 hours.