Download CMUSIC for NeXT: CARL-NeXT.tar.gz
The NeXT version contains a partial port of the CARL software, including the cmusic program (modified slightly to know about NeXT .snd files) and the pv phase vocoder program (fully described in my book Elements of Computer Music). The NeXT version of cmusic is essentially the same as the "classical" one except that it includes a new "-f" flag, as in the command
cmusic -f score.sc
which causes cmusic to directly create a soundfile called "score.snd" (corresponding to the scorefile name) rather than requiring the usual pipe to another program which writes sound files to disk (the one for the NeXT platform is called "tosnd" and is included).
Files have been compressed with gzip. When uncompressed with, say, gunzip, they each become MUCH larger tar files containing many directories, subdirectories and files containing all the sources and documentation for CARL software.
The software distribution contains much (though often somewhat out-of-date) documentation. The best source of information on cmusic and the pv programs is my book Elements of Computer Music (be sure to obtain the third printing (the Library of Congress page says "10 9 8 7 6 5 4 3") which contains corrections of hundreds of errata as compared with earlier printings (this printing was done in early 1994). For other software the included documentation (man pages, help files, etc.) is largely correct.