Unprecedented for the Disney Music Group, three soundtracks hold positions on Billboard’s Top 10 Top Album Sales Chart for the week ending January 4, 2015.   The Grammy®-nominated Guardians of the Galaxy is No. 2 with 70,000 units, Into the Woods is No. 3 with 51,000 units, and the Grammy®-nominated, triple Platinum Frozen is No. 10 with 29,000 units, according to Nielsen SoundScan.  The last time one music company had three soundtracks in the Top 10 was in 1978 (RSO’s Saturday Night…