Ry Cooder and V.M. Bhatt - A Meeting by the River
Baaba Maal and Mansour Seck - Djam Leeli: The Adventurers
Pretty much anything by Ali Farka Touré.
All 'world music' admittedly but what is really good about them (apart from the music) is that none of them are firewalled in terms of dynamic range.
No one has mentioned any classical stuff, I really like Shostakovich, pretty much all the versions of his symphonies I have are good but my favourite would be Mariss Jansons and the St Petersberg Philharmonic Orchestra set. To really let a system breath Allegro non Troppo (4th movement) from Leningrad does the trick, but it is a tad long at 16 minutes.
Keeping the Russian theme, Stravinsky: L'oiseau de feu (The Firebird), ballet suite for orchestra, either by the composer and the Columbia Symphony Orchestra, or Bernstein's with the NYPO are great.
Colin Davis with the LSO's Sibelius symphonies are also very good.
Other flavours of classical are also available
![Violin :violin:](./images/smilies/eusa/violin.gif)
For the record I only ever went to one show at Heathrow, and ran away, my abiding memory is of one room with some huge American amplifiers driving some wafer thin floor standers with about 20 2in drivers. An acquired taste to say the least, so much so that I couldn't tell you what the hell was being played.