This template simply links to the generic category included in the parameter. Usage example:
{{Cat|Composers}} → links to [[:Category:Composers]], displayed as Composers
This template can be used for composer categories, except that the composer’s name must be listed in the format Surname(s), First names(s), and the link displayed will appear the same:
{{Cat|Bach, Johann Sebastian}} → Bach, Johann Sebastian
If you wish to display the composer’s name in normal written order, use {{LinkComp}} instead; if you wish to display only the composer’s surname, use {{LinkCompS}}.