Barry, I have to thank you for dragging me in to yet another M7 obsession. Just kidding; for me this is the meaning of life and I was overdue.
I've been surveying available recordings and will offer a few observations. I started out by concentrating on the finale since it's always made the least sense to me. Now after all these years, it seems structurally solid, in a good performance. In some cases I've listened to most or all of the work, sometimes in order, sometimes not.
The performances that annoy me introduce tempo changes that Mahler didn't indicate. In the score, the tempo modifications are usually quite subtle. In a work that is inherently episodic, keeping steady tempos is essential. One might say that not many roses line the path traced by this symphony and we have no reason to stop and smell them.
When I go through one of these surveys, I rarely have a radical change of view but this time around I've noted some surprises. Some may admittedly owe to memory that has not improved with age.
First, I'll note the excellence of the Kubelik/BRSO studio recording. His first movement is the only one I'm aware of that clocks in at under 20 minutes. It doesn't feel rushed but conveys a welcome sense of urgency. While the SQ is dry and dated, it is also unusually transparent and the woodwinds speak with a color and presence that embarrasses many newer recordings. The seating arrangement helps too, with antiphonally divided violin sections and low strings on the left. The remaining movements are in the same vein. Nachtmusik I is often played too slow (it is marked Allegro moderato), but moves along smartly here. And since it's a march, steady tempos really help it to work. The Scherzo is just terrific.
One surprise was how much I like Haitink/RCO, aside from that notorious crescendo in the penultimate bar. Like Kubelik he keeps the tempos moving along and applies a light touch with changes. The recording while dated is also detailed and transparent. Even the Scherzo is excellent, perhaps surprising because Haitink tended to mute the demonic elements in Mahler's music.
I'm not sure I had ever listened to Kondrashin/Leningrad all the way through. It's another standout, provided you can acclimate to the congested Soviet-era sonics.
I tried two movements of MTT/LSO (RCA) but went no farther because the SQ is nothing special, tempos are stretched around, and it doesn't feel contrapuntal.
I haven't listened all the way through the Boulez/Cleveland but the Finale is quite good. Perhaps the Emil Berliner remaster helps the SQ; on the original issue, it lacks presence and bite, as though we're listening from the lobby.
The Ozawa is not one of his better performances. He was usually among the most straightforward of conductors but frequent ritards repeatedly kill momentum. It doesn't help that the trumpets, and to a lesser extent the horns, tend to play a phrase where each note is accented as a smooth legato.
Levine/CSO is a very strong contender, with one caveat. He maintains momentum and the recording is better than many of the others in the set. The soft strokes on the tamtam in Nachtmusik I are wonderful, in the deep bass as they should be. My concern is with a too-slow Nachtmusik II clocking in at over 14 minutes. He doesn't mess with the pace but for me this movement works better at a more flowing tempo even if I'm not sure I'm on board with Boulez's breezy 10:38.
Jansons/BRSO is one of the strongest performances though the bells in the Finale are underwhelming.
I need to spend more time with Nott/Bamberg but his Finale is outstanding and in excellent SQ, although in that penultimate bar he plays a late-Haitinkesque sforzando rather than a diminuendo. Like Kubelik he seats the orchestra in the common 19th Century arrangement.
I'll be spending more time with these and a few other recordings in the coming days and will offer comments if I come up with anything that might be interesting.