'/usr/bin/abcm2ps' (abc2ps) is not existent.
'/usr/bin/convert' (im_convert) is not existent.
'/usr/bin/abc2midi' (abc2midi) is not existent.
If you do not wish to install it, you can change the 'displayType' to '0' ('image only').
'/usr/bin/ps2pdf' (ps2pdf) is not existent.
If you do not wish to install it, you can leave it blank and a ps file will be generated instead.

ABC midi

This page demonstrates the ABC midi wiki plugin.

see also:

follow a Tutorial and introduction to Abc notation.
ABC midi website at sourceforge.
The ABC music notation standard
timidity - linux midi player. (timidiy is a terminal-application that can be launched by a web-browser to play midi files.)

Example

Here's a little tune from the ABC midi website.

The following ABC notation

X:01
T:Paddy O'Rafferty
C:Trad.
M:6/8
K:D
dff cee|def gfe|dff cee|dfe dBA|dff cee|def gfe|faf gfe|1 dfe dBA:|2 dfe dcB||
~A3 B3|gfe fdB|AFA B2c|dfe dcB|~A3 ~B3|efe efg|faf gfe|1 dfe dcB:|2 dfe dBA||
fAA eAA|def gfe|fAA eAA|dfe dBA|fAA eAA|def gfe|faf gfe|dfe dBA:|

… renders (and plays) as :

X:01
T:Paddy O'Rafferty
C:Trad.
M:6/8
K:D
dff cee|def gfe|dff cee|dfe dBA|dff cee|def gfe|faf gfe|1 dfe dBA:|2 dfe dcB||
~A3 B3|gfe fdB|AFA B2c|dfe dcB|~A3 ~B3|efe efg|faf gfe|1 dfe dcB:|2 dfe dBA||
fAA eAA|def gfe|fAA eAA|dfe dBA|fAA eAA|def gfe|faf gfe|dfe dBA:|