1 5 string violin, 1 5 string viola, 1 6 string violin, 1 5 string cello.
I think...

By the way - can anyone fill gaps or correct/add detail to the list of "what I heard"? I'm curious to know how much I got right!
Greensleeves - Henry VIII
I think - THINK - this next is Handel's Hallelujah Chorus
A snippet from Eine Kleine Nachtmusik by Mozart
Part of Beethoven's 9th Symphony (Ode to Joy)
William Tell Overture - Rossini(??)
Nessun Dorma
(Verdi?) - Puccini (Turandot)
Bach/Gounod Prelude/Ave Maria
Beethoven 5th Symph - opening
Also Sprach Zarathustra AKA 2001 Space Odyssey (Strauss)
(something else in here?)
The Can-Can - not sure who wrote it, it appears in Orpheus in the Underworld by **
Gluck Offenbach (thanks skylark!) ** but don't know if he wrote it
Toreador's song from Carmen - Bizet
One of the Hungarian dances - Brahms
Dance of the Sugar Plum Fairy from Caisse Noissette -Tchaikovsky
In the Hall of the Mountain King - Grieg
(not sure but think the second half of it may have Rimsky Korsakov's Flight of the Bumblebee under it - or it may be something entirely different - sounds like it could be though...) - morphs into a James Bond theme(?) then back to the Grieg
Don't know if the next bit is from something, but it goes into The Entertainer by Scot Joplin
Singing in the Rain - don't know who wrote it, cleverly played over the top of Doh a Deer from The Sound Of Music - I don't know the composer off the top of my head. ** Richard Rodgers **
There's No Business Like Showbusiness - don't know who wrote it!
Summertime - Gershwin
In The Mood - Glenn Miller
Intro to New York, New York
Hound Dog - Elvis
The next bit (between the end of Elvis and the "wolf whistle") sounds like the intro to Pretty Woman
I can't work out what the next song is, then it goes onto:
Yesterday - The Beatles
I Feel Good - just a snatch
Staying Alive - the Beegees
Money Money Money - Abba
Another One Bites The Dust
The bit that sounds like a guitar solo - I recognise it but can't place it, this goes for the bit after as well!!** Layla, I'm confidently assured, plus possibly something else? **
** Billie Jean by Michael Jackson is in here somewhere **
** some more famous guitar stuff ** Smoke on the water - Deep Purple (Sarah can't read....)
"Jaws" theme music
"Pyscho" theme music
Ride of the Valkyries by Wagner (very fast and not at all convinced I am right...)
Theme from Dallas
or Dynasty - some 80s American soap opera anyway...Rule Brittania
Sailor's Hornpipe - I forget the composer

but the one they play on the last night of the Proms.
I think one of the Pomp and Circumstance marches by Elgar? - another Proms piece... and don't know if there's anything else in the last mad dash, but that's the end. ** possibly some Lohengrin wedding music **