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?

[rab] No, you only had about half of them. There are a full *eight* main chords at the start of each of the first eight bars (which you gave a "plang" to), the first seven each having a "chong" on the lowest bass F of the piano halfway through the bar...

And now a piece that you might be able to guess, just from the rhythm that runs through the entire piece as a background, which I'll give two bars in italics
TUM-tiddly-UM-tiddly-UM-tum
TUM-tiddly-UM-tiddly-UM-tum...
Deeeeeeee, da-da-doo-da-da-da dee, da-da-deeeeeeeeee - Da-da doo-da-da-da-deeee.....