The Boston Symphony and the Los Angeles and San Francisco Opera companies are among those who have recently begun podcasting.

The Philadelphia Orchestra's trial podcast series is its latest media venture; the orchestra recently launched an online music store, returned to national radio broadcasts through an agreement with National Public Radio and signed its first recording contract in nearly 10 years with Ondine Records.

The podcasts will be available on April 5, 12, 19 and 26. Visit podcasts.philorch.org to subscribe.