Unplayed albums

[fduggan]

Hi guys,a good friend of mine has a small collection of albums,mostly boxed sets which have never been played and she's asked me to find out if they're worth anything.I've said I will try and find out.They are as follows:
The great waltzes of Johann Strauss(I need to find out the name of the conductor)
Classical gold 11The Royal Philharmonic orchestra (unopened)
The classical collection,Beethoven,Liszt,Debussy,Chopin,Tch
aikovsky,etc

The best of Mario Lanza Collectors edition
Sinatra The reprise years(unopened),
I realise I need more info,but can anyone help with websites?I've tried researching the names on eBay to find similar but when I get to what should be the correct page everything comes to a full stop.TIA

[Andyrory]

Discogs or EIL.

[HowardKennitby]

this might help

http://www.musicpriceguide.com/

[fduggan]

Thanks guys will try them x