Live from London's Royal Albert Hall, Stephanie Hughes introduces the Los Angeles' Philharmonic, conducted by Esa-Pekka Salonen, as they perform the London premiere of American composer John Adams's Slonimsky's Earbox.
The concert also features Gustav Mahler's song cycle Leidereines Fahrenden Gesellen, with soloist Lorraine Hunt (mezzo-soprano), and, after the interval, Jean Sibelius's Four Lemminkainen Legends.
In the interval, there's a visit to the ancient landscape of Finland, home of the Kalevala, the mysterious and magical epic on which Sibelius based the aforementioned work.
(The Prom can be also be heard on Radio 3)
(See today's choices)
(The penultimate concert in the series of four recorded Proms is on Thursday at
10.55pm on BBC1)
(BBC Book: BBC Proms 98, price £3.99, has details of this season's events)