We recommend strongly that you use your Spotify app.  All family members and guests can easily connect the network music player to their Spotify apps on their own phones, tablets or computers.

Be sure that you have a Spotify premium account - if you don't, get it here. You will really enjoy the premium account. It offers high quality audio, plays any song anywhere, is totally ad free and has unlimited skips. You can listen offline as well which is a great feature, and maybe most important of all - you can stream Spotify to the network music player over Wi-Fi.

The music is directly streamed from Spotify's servers to the network music player - leaving your phone free for making calls and all other uses. You only use your phone to control music playback. You can also just pick up the music where you left off when switching between your phone, tablet or computer. It is seamless streaming. Choose Player as a device.

This is how to connect

Open up the Spotify app. 
Start playing a song.
At the bottom, click on the grayed device icon.
On the "Current device" page choose Player. The device icon turns green when Spotify redirects the music to your Network Music Player.

You can use a free account instead...

. . . then stream with Bluetooth or Airplay. Works well too.

 

Spotify is a registered trademark by Spotify AB, Stockholm, Sweden. Note that Spotify is not in any way affiliated with Retro Audiophile Designs.