Only Connect

[Lat-Literal]

Earth, fire (Falla), wind/air (Partch), water....but probably not.

[Lat-Literal]

Oh.

[LMcD]

I have devised a (purely musical) wall which I'm happy to post if required tomorrow morning, but if anybody else would like to offer one first I'm quite happy to wait!

[LMcD]

Here's LMcD Wall 2. This is purely musical and should prove relatively straightforward.

PISTON / SONDHEIM / MUSSORGSKY / RACHMANINOV
ALBENIZ / STRAUß / D'INDY / SMETANA
IRELAND / HOVHANESS / MENDELSSOHN /SCHUMANN
WAGNER / SMETANA / STRAUß / STRAUß

[Boilk]

Here's LMcD Wall 2. This is purely musical and should prove relatively straightforward.

LMcD: assuming this is an unresolved wall with random ordering in each line?

[LMcD]

Your assumption is correct.

[Boilk]

In that case there's probably a “Mountain” series:

MUSSORGSKY: Night on the Bare Mountain
STRAUß: Eine Alpensinfonie
D'INDY: Symphony on a French Mountain Air
HOVHANESS: Mysterious Mountain / Mountain of Prophecy / Mount St. Helens Symphony (and several other mountain-themed symphonies of his)

There’s also J. STRAUSS SNR: Die Berggeister (The Mountain Spirits) but not very well known.

[Flay]

....should prove relatively straightforward.

I've heard that before

Any chance of a tiny clue?

[LMcD]

Mountains are indeed one line of the wall, and 3 of Boilk's 4 (#245) are correct. (I had 'Mysterious Mountain' for Hovhaness, but the others you mention are fine)
There are 2 Straußes involved, neither of them being Johann Strauß the father.
When you get tired of the mountains, you might fancy something less challenging.

[Flay]

Sondheim - Hills of Tomorrow.

Just saying.

[Boilk]

What's so far confirmed.

[Flay]

Ireland - The Hills (chorus a capella)

I'm going out so can only fling in ideas

[LMcD]

Guess work, but we likely have nature connections all round...

1. Mountains: (Hovhaness confirmed, possibly Mussorgsky's Bare Mountain, d'Indy's French Mountain Air symphony, and R. Strauss' Alpensinfonie)
2. Rivers: (possibly Smetana's Moldau, Strauss's Blue Danube or some other river; Wagner's Rhine Journey?)
3. Hills: (Ireland, Sondheim, Piston)
4. Regions: (Mendelssohn Hebrides?, Albéniz Iberia?)

You're making steady progress!
No Mussorgsky mountain.
No Wagner river.
No hills at all.
No regions but The Hebrides is/are involved.
Mendelssohn and Albeniz are in the same group.

[Boilk]

Based on LMcD's replies #247 and #252

[Lat-Literal]

Based on LMcD's replies #247 and #252

Piston - Three New England Sketches (Mountains)?

I've been observing this.

There are composers I should know, Piston and Albeniz among them, also Rach; maybe Ireland; and ones I wouldn't expect to know - that other Strauss etc.