⌂ Using a custom \elseTag command to replace several \tag commands

The purpose of the \elseTag command is to make the use of tagged music easier.

This exemple shows the same music, without and with \elseTag.
In the old manner (first exemple), you have to write all the tag names you want,and to omit only the one you don't want.
In the second exemple, \elseTag exclude automatically the tag you don't want, and keep all the others.

\elseTag has the same syntaxe than \tag and has to be use in conjonction with \keepWithTag.