The videos, which range in length from one to five minutes, discuss important works by the two composers, illustrated with still photographs, paintings, images of scores, video, and musical examples. They originated on the orchestra's ambitious web site as part of its three-year-old Online Conservatory project, but are now available through Apple's iTunes music store.

The videos can be watched in the free iTunes software or downloaded onto a video-enabled iPod.

The BSO's Beethoven/Schoenberg series, conducted by music director James Levine, began this past winter with performances of Beethoven's Missa Solemnis and Symphony No. 9, Schoenberg's Gurrelieder and Pierrot Lunaire, and other works. It concludes next season.