pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-19826-21504_Calisthenic_Rondo.ps) >>/Users/jc/w/tmp/Tune-19826-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/21504_Calisthenic_Rondo.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_19826.log 298811 Log file, useful mostly for debugging
Tune-19826-21504_Calisthenic_Rondo.abc 705 ABC music file with the extracted tune(s)
Tune-19826-21504_Calisthenic_Rondo.ps 36356 PostScript
Tune-19826-21504_Calisthenic_Rondo.txt 705 Plain-text file with the extracted tune(s)
Tune-19826-get.log 10397 Log file, useful mostly for debugging
These files should be available for 24 hours.