Lists of items, such as the newest audio or the members on a profile, are made by templates. You can change how a list looks in one place, or everywhere.
In the template that shows the list, give {jrCore_list} your own template:
{jrCore_list module="jrAudio" order_by="_created desc" limit="5" template="my_audio_list.tpl"}Jamroom looks for my_audio_list.tpl in the active skin's folder. Only this list uses it. A good start is a copy of the module's own item_list.tpl, from modules/jrAudio/templates/.
To change a module template everywhere, put a template named <module>_<template> in your skin. For example, jrAudio_item_list.tpl in the skin's folder replaces modules/jrAudio/templates/item_list.tpl on every page.
You can also change a module's templates on its Templates tab (ACP > Modules > (module) > Templates), with the Template Editor. See Using the Template Editor.
For more, see Altering a Module's Template.