The whole system is immensely versatile: I really only scratch the surface. The Logitech Media Server (LMS) offers the facility to add plugins, and over the years many official and third party plugins have been developed. I usually use LMS in preference to the Logitech maintained server MySqueezebox.com, and use it for playing local music files (a mixture of flac and mp3 format) and streaming radio. I scrobble my listening to Last.FM, but I don't subscribe to music streaming services. You can synchronise music between two or more devices, alternatively you can play different music to each device. Like I say very versatile.

Flies and Bikes Blog
Squeezebox RIP
A few years ago, I encountered a review of a networked music player that seemed rather useful - the Squeezebox. This was a small unit that connected wirelessly to a computer on the home network (or to a manufacturer-maintained server on the internet) to stream digital music from numerous sources. The Squeezebox itself connects to the HiFi via analogue of digital outputs. The Squeezebox line of devices had been acquired by Logitech from its original manufacturers, SlimDevices. Over the following years, my Squeezebox system expanded to include a Squeezebox Touch, two Squeezebox Radios, and a number of software players for laptops and iPads, with my my music hosted on a QNAP NAS, running 24:7. You can see the general setup in this diagram (the Touch and Classic connect to the HiFi, while the Radios are standalone players):