What fun this is! Already there's so much more I hear I didn't realize was going on until I saw it on paper. Mahler was so brilliant, I bow down.

I wanted to mention the book
Gustav Mahler: The Symphonies by Constantin Floros that others have talked about on GMG, it really is an indispensable resource for this kind of study. The most important thing it addresses for me is Mahler's form (with measure numbers!) which helps immensely when wading through such long dense music. Mahler often twists and transforms his themes so completely by the end of a movement, this is tough to follow upon hearing but much easier to read about.
I have some experience reading orchestral scores and have taken orchestration, so following is okay, but trying to figure out how it all fits together with Mahler is the challenge. And I'm not great with other languages so I'm always trying to remember exactly what the score directions mean. Though I do have Dover Study Editions (which can be had quite cheaply through
Amazon or
EBay) which have a glossary for basic definitions.
I was so immediately fascinated with Mahler's writing and orchestration I knew seeing the scores I would be like a kid in a candy store.

And I end up spending so long entranced with one part I haven't gotten through much of it yet! But last night I dove right into two "pieces of candy", the amazing
Sturmisch bewegt of the 5th and the rousing
Rondo-Finale of the 7th. Hmm, I guess I could've started off easier!
But you have a whole new appreciation for different recordings when you follow along with the score. That's another dimension I love about score-reading. I wish I had so much more time to do it! One thing I love about collecting is how conductors differ in their interpretations and considering the why behind their choices. Does he stick by the score or do something very different? And if he does, does he justify it? I'm tempted to go off onto the merits or interesting finds I've come across with some recordings I've used, but will get into it more sometime in the Recordings area. I think it's fascinating though, especially in cases where in instrumentation something is omitted, or added, I'm not sure what to think about that yet!
To clarify my question about recordings, for those familiar with the scores, who is especially idiomatic tempo wise? I don't have that many recordings yet (4 or so of each symphony) and was curious so I have some kind of general idea, I guess this might suggest a sort of middle of the road interpretation. There's my Mahler-blat for today...

PS - In the 5th, I saw the direction
mit dem Bogen geschlagen - literally "with the Bows beat", is this the same as
col legno?