In reply to Tall Clare:
Then is it just possible that you have made your digital music less accessible around the house?
Your CD's can be played anywhere on a whim but your MP3's can only be heard sat at the computer or streamed to a single room with the sound bar thingy.
Also how is the state of the metadata/tags of your digital music?
I'm guessing that if you ripped the music from CD's then it will either be non existant or very poorly and randomly structured. This again makes it harder or less convenient to find the exact track, artist or ganre than to pick up a CD and pressing play.
If your digital music was easier/quicker to search and then play where ever you chose throughout the house, would you not choose to play it more?
Hopefully my following suggestions are not trying to teach you how to suck eggs if they are all ready in place, but they have helped me to fully unlock my music potential at home.
First off, you have to comprehensively nail the Tags assossiated with every single MP3 track on your hard drive. And this takes time, but is essential.
Last year Blanchie told me about a bit of software called MP3Tag. This was invaluable to help me get my tags and artwork in order as it automatically fixed them for me, mostly using Amazon's own database to do the work.
http://www.mp3tag.de/en/
Once you think that you have fixed your Tags, go into what ever music software you use and check everything out. Personally I use Windows Media Player. Pay particular attention to any unknown artists or unknown song titles. Find out who they are and get them tagged correctly.
Next and this is the most important of all, sort out the genras. At first you will have a mass jumble of varying descriptive styles. An example would be Brit Pop and Pop. They are both Pop so why have two conflicting tags?
It will only make it more complex to listen to your music.
Once you have your file structure (Tags) organised then you can release the full potential of your music. You can then choose to listen to it how ever you want when the mood takes you. You can listen to a specific artist, album, style of music or even all at random.
This effort can take weeks or months, depending on the size of your collection. But it only has to be done once, correctly, and updated with each new album added to the collection to keep on top of it.
Now you can listen to what ever you want, even quicker that trawlling through a shelf full of CD's.
The next problem is, even though you can select your music effortlessly you are restricted to the locations where you can hear it. You either have to be sat at or near your computer or in the room with the big soundbar. What if you want to listen to your music upstairs?
You need to find ways to stream your music throughout your house, and this can be as expensive or cheap as you wish depending on the kit you have at home. Everybody's setup is different and organic in a way.
My setup revolves around my wireless router and Network Storage Access device. All my music is on the NAS box which does not need the computer to be switched on to be used.
I then have a mixture of wifi speakers and bluetooth speakers of varying shapes and sizes which allow me to listen to my music how and where I please from the garden to the bathroom.
If you have a smartphone with blootooth than you can stream music to that and bang the tunes out on a blootooth speaker. Tesco have some excellent Teknicas for £20.
You mentioned that you have a sterio system upstairs. You could buy a logitech wireless speaker adapter and plug this into your sterio. This would then allow you to stream music from your computer to the sterio upstairs. Its a cheap form of a SONOS as it only costs about £25. A SONOS costs a lot more.
I also have one SONOS speaker, and love it, the only problem is that I wish I could buy more to put around the house as they are so versitile with sound quality good enough for my ears.
SONOS differ from bluetooth as they work through the router and wifi. This means that you can have as many SONOS speakers as you can afford throughout the house all playing in sync or individually.
With bluetooth you can only have one speaker working at a time with one computer. Its the only drawback of bluetooth speakers.
Once you have your tags organised and a method to stream your music around the house as effortessly as a CD then you will listen to it more. And if you can do this, then instead of having the fist full of CD's beside the CD palyer you have your entire catalogue of music to play.
For me, the initial effort was worth it. There is no point hiding away CD's or vynal if your media of choice is not as accessable or harder to use.