Inspired by his native Finland, the composer Sibelius wrote music that captures the country's folklore and landscape. Tonight at 7:30 at Severance Hall, baritone singer Simon Keenlyside performs a cycle of these rarely performed works chosen from an output of roughly 100 songs. The bill also includes Grieg's popular incidental music from Peer Gynt and the Richard Strauss piece, Au Italien. Consult the orchestra website for more info. The program repeats at 11 a.m. tomorrow (sans Sibelius) and at 8 p.m. on Saturday. A pre-concert talk from Rose Breckenridge, lecturer and administrator for Cleveland Orchestra Music Study Groups precedes the Friday and Saturday night's concerts. (Niesel)