Beethoven’s Wig. Cambridge, MA: Rounder Records. $11.99 at iTunes. A favorite at the Bauer household, this puts (silly) words to great music, builds familiarity, and reveals the underlying structure of symphonies and other music forms. Sing-Along Symphonies. 2002. Vol. 2: More Sing-Along Symphonies. 2004. Vol. 3: Many More Sing-Along Symphonies. 2006. Vol. 4: Dance-Along Symphonies. 2008 ($14.98).