Sound quality is highlu subjective. The DRG reissues of theCDs that were origianlly on EMI/Broadway Angel 10 years ago don't sound all that different mainly because the originals were quite well done.
SONY/Columbia Broadway Masterworks reissues of HOUSE OF FLOWERS and LI'L ABNER were huge improvements over the original issues which were quite poor. The other Sony reisues were also major improvements although the first CD's of CABARET, COMPANy, NIGHT MUSIC, MAME et al sounded quite fine.
Of the Sondheim's the one most in need of audio upgrading was MERRILY which always sounded dim on cd..it was first mastered and issued on CD in 1986 when Cd's were fairly new. SUNDAY and INTO THE WOODS were all digital recordings which sounded excellent so it will be interesting to see if these new editions beef up the sound. SWEENEY was an analogue recording (pre-digital) but always sounded fine on LP and CD.
Are we sure that the bonus tracks on MERRILY are Sondheim demos? I called RCA the day after the cast album was made to inquire when it would be released. The rep I spoke with advised they had recorded the whole score including songs that were cut and that it would probably be a 2 LP set. Of course some execs were hopoing for a 0 Lp set of a show that had been a huge flop. In the end it was a single Lp. The CD restored "It's a Hit" which was missing from the Lp. But I always wondered whether they really did record "Honey", "The Blob" and "Thank You for Coming" all of which were in the show when I saw it in previews.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com