It may seem a bit odd to combine Mahler with Hindemith, but the combination makes for a quite pleasant listening experience.
Most Mahler cycles tend to leave out Blumine (originally a part of his first symphony) and Totenfeier (which ultimately became the first movement of his second symphony) and sometimes also the adagio of the tenth symphony, so it is good to have them on one disc.
Hindemith lived to be 17 years older than Mahler, saw himself as a composer who also conducted (rather than the other way round like Mahler) and as a consequence composed a body of work next to which Mahler's is dwarfed (in numbers, not in stature).
The Sinfonische Metamorphosen is a splendid work (all four movements, but the march especially) and it is over in 21 very enjoyable minutes. Mathis der Mahler, an equally fine work is slightly longer while the tonally most modern sounding work, Neues vom Tage, is relatively short.
Rickenbacher and his Bambergers make the most of these harmonically dense works; all details are wonderfully clear and concentrated listening is a very rewarding experience indeed. Afraid of Hindemith or Mahler? Shove these discs in your player and all fear will disappear at the first drop of Rickenbacher's baton.