[Darren] Rentaghost methinks (Gadzooks mistress Meeker)

Classical, in the loose rather than the strict sense of the word.

Plang-chong. Perlang-chong. Plang-chong. Plang.
Plang plong pli pa-dang!
Bubadidididida bubadidididida (continues underneath)
Daaah-di daaah-di daaaah-do ya-di-da
Daah-di ya-di-daaah do daah do-ya-da
Daaah-di daaah-di daaaah-do ya-di-da
Daah-diiiiiii di-yaaah-di dooo

Can supply more if need be, though I would probably stop well short of the whole thing :)

Ravel's Bolero?

Sorry, forgot the code [Darren No. 19] Rentaghost? [Rab No. 20] Ravel's Bolero?

[Bigsmith] No, although my rendition is not perfect (done from memory).

There might be more plang-chongs in the intro.

[Bigsmith] Correct! Number 19 is, indeed, Rentaghost.

[rab] It's not the opening from Handel's Messiah is it?

Update:
1. Bob the dog - ISIHAC Theme 2. Chalky - Coronation Street 3. HB - Some Mothers Do 'Ave 'Em 4. Raak - Thunderbirds 5. Kim - The Archers' Theme 6. rab - Roobard and Custard 7. Bob the dog - Pomp and Curcumstance, Edward Elgar 8. Lib - Blind Date 9. ZK - Dangermouse 10. penelope - Blue Peter 11. Watty - Porridge 12. Kim - Tom & Jerry [Fred Quimby version] 13. Herr Bratsche - Monty Python 14. Raak - Star Trek 15. Bob the dog - Dr Who 16. rab - Have I Got News For You 17. Darren - Bergerac 18. Chalky - The Sweeney 19. Darren - Rentaghost 20. rab's plang-chonger - ???

[Darren] Nope. A hint?

No 21. Another TV theme. 80's/90's.
Do-dooo,do-do-do-do-do-doooooo
La-laaa, la-la-la-la-la-laaaaa-la [repeat lines 1 and 2]
Da-daaa-da, da-daaaa-da, da-da-da-da-da-daaaaa,
Da-daaa-da, da-daaaa-da, da-da-da-da-da-dahhhhhhhh, bom-bom-bom.

[Dazed5 - number 21] It's Blackadder. [rab - number 20] Yes please.

Number 22. Yet another TV theme from the 80s.

dum-diddliddle-dum-dit-dit dum-diddliddle-dum-dit-...
dododummydummydummydummy-dooooo-do-doooo
do-diddliddliddliddliddliddle-doo-doooo
dododummydummydummydummy-dooooo-do
dodiddliddliddle-dee-dee do-dooo
do-do-do-dooo dee-dee-dee-doooo
dee-dee-dee diddliddliddle-doo
do-do-do-dum-doo do-do-do-dooo-dooo, dee-deeeeee
dum diddliddliddliddliddliddliddliddle.... etc.

[Darren] Sure is.

No. 20; Late romantic, Classic FM friendly piece, though if you're a Classic FM devotee the chances are you've only ever heard the slow movement. I posted the start of the first movement.

Very large orchestra for this one. Composed in the late 1800's... normally

Da-da-da-da-DUM,
...da-da-da-da-DUM,
...da-da-da-da-da-da-da-DUM, da-dum.

I suspect Watty will get this one straight away...

um, sorry about the "normally" there, was going to write something else but deleted it and missed a word.

Um, sorry, this is number 23.

[rab] your number 20 is Rachmaninov's Piano Concerto number 2 in C minor and I claim my £5.

*laughs* Indeed. No. 23, as JLE knows, is my mobile ringtone, also known as Symphony No.2 "Resurrection" by Gustav Mahler.

[JLE] Can't stretch to a fiver, but how about some penny chews? I had a hunch you might get that one :) Did I get the number of opening chords right?