Plot: From the Royal Albert Hall, the BBC Philharmonic conducted by Juanjo Mena open the Proms on BBC Four with two of Richard Strauss's best-loved works - Also Sprach Zarathustra, with its spectacular musical sunrise, followed by his serene Four Last Songs, sung by the German soprano Anne Schwanewilms. Also on the programme is Sibelius's majestic Symphony No 7 and the UK premiere of Kaija Saariaho's Laterna Magica, her personal tribute to the films of Ingmar Bergman