Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book27/Landrin_Potpourri.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3991-Landrin_Potpourri.ps) >>/Users/jc/w/tmp/Tune-3991-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book27/Landrin_Potpourri.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-3991-Landrin_Potpourri.abc 156 ABC music file with the extracted tune(s)
Tune-3991-Landrin_Potpourri.ps 6 PostScript
Tune-3991-Landrin_Potpourri.txt 156 Plain-text file with the extracted tune(s)
Tune-3991-RSCDS_Graded1.abc 152 ABC music file with the extracted tune(s)
Tune-3991-RSCDS_Graded1.ps 6 PostScript
Tune-3991-RSCDS_Graded1.txt 152 Plain-text file with the extracted tune(s)
Tune-3991-get.log 12878 Log file, useful mostly for debugging
Tune-39913-WilliamCampbell_10thBook_1798-V1.abc 169 ABC music file with the extracted tune(s)
Tune-39913-WilliamCampbell_10thBook_1798-V1.pdf 2217 Portable Data Format
Tune-39913-WilliamCampbell_10thBook_1798-V1.ps 6 PostScript
Tune-39913-WilliamCampbell_10thBook_1798-V1.txt 169 Plain-text file with the extracted tune(s)
Tune-39913-get.log 19890 Log file, useful mostly for debugging
Tune-39914-get.log 9220 Log file, useful mostly for debugging
Tune-39915-get.log 5487 Log file, useful mostly for debugging
Tune-39916-get.log 16369 Log file, useful mostly for debugging
Tune-39917-get.log 4977 Log file, useful mostly for debugging
These files should be available for 24 hours.