Chosen Solution

I would like to utilize my mac mini 2006 1.6 GHz as an iPod like device to play my own music collection of songs and playlists through my existing stereo system. I would like to be able to select playlists or specific songs through some type of remote.

Great idea! Sadly, your system is limited here. A newer model would work! I was using a 2011 model doing this with an iPad as my remote for my TV & movie shows to my TV. It wouldn’t be much of a stretch to link in your stereo instead of a TV. I was using: Rowmote Pro on my iPad (it could be an iPhone) accessing iTunes on my mini. Today I’m using an AppleTV as the front end and controlling it directly from my TV.

Why not try a DLNA Server or a DLNA Client? For Client, I’ll use KODI.