The Altadena Children's Choir is starting rehearsals for its "Music for a Green Planet" fall choral concert.  Clsses begin on Tues., Sept. 24.  Performance dates on Jan. 23 and 24, 2010.  The choir is a non-profit, independent performing body with no religious affiliations.  For more information, call Dr. Karen Reinhard, director, 626-797-4758, or go to www.altadenachildrenschoir.org.