It's a great thing when major orchestras release new recordings of contemporary art music. It's an even better sign of the vibrancy of the classical music business for that to happen under the auspices of a new major international initiative that brings together commercial and non-profit entities.
The First Symphony is probably one of the most often performed works of Mahler since it doesn't take two hours or involve 1000 musicians. But Mariss Jansons and the Royal Concertgebouw Orchestra. There are two words I always say about them: "Oh wow."