Taking it further, perhaps for those whose energy levels have yet to subside and who can survive without a remote control facility, the 12" single is the supreme format for recorded music.
The time constraints of this form impose a discipline that can really help focus the producers and artists. IMHO this has yielded some memorable music. The format also has the potential to sound great, look good, yet be affordable to most of us! Extended mixes in this format often need & encourage aural experimentation to maintain musical interest beyond the 3 minutes that the songs usually justify. Admittedly this often doesn't work and production cliches abound. However when it does work the results can be wonderful: some of the 12" recordings I enjoyed in my lively phase were from Joy Division, New Order, ACR, Manu Dibango, Material (Laswell), Dillinger, Human League, Ian Dury, and of course Chic! I'm happy to see from my 16 year old daughter that this format is still very much alive albeit often at 33rpm.
I also have great regard for the 35 - 50 minute LP and for the convenience of CD. At least CD lets you skip the crap and on one early CD player I had the machine recognised individual CDs and could be programmed to only ever play selected tracks from each of these. I guess one of the main attractions of hard disc replay is the ability to customise programming so that all the CD filler tracks can be consigned to the great void for excess filler music.