Below is information from shntool on the SHN files in this directory.

First is the output of  shntool len  in column form.
In the table, a - means OK; an x means not applicable or not determined.
Other letters indicate potential problems.

    length     expanded size   cdr  WAVE problems filename
    20:31.42      217247228    ---   --   ---xx   Sweetheart Rehearsals 1.shn
    28:41.11      303610316    ---   --   ---xx   Sweetheart Rehearsals 2.shn
    73:59.33      783117260    ---   --   ---xx   Sweetheart Rehearsals 3 (clock tape).shn
   123:12.11     1303974804 B                     (totals for 3 files, 0.5146 overall compression ratio)

A b in the CDR column indicates an SBE (sector boundary error)
An h in the WAVE column indicates a non-canonical header
An e in the WAVE column indicates extra RIFF chunks
A c in the CDR column indicates audio is not CD quality

An s in the CDR column indicates audio is too short to burn
A 3 in the problems column indicates the file contains an ID3v2 tag
An a in the problems column indicates the audio data is not block-aligned
An i in the problems column indicates an inconsistent header
A t in the problems column indicates possible truncation
A j in the problems column indicates junk may be appended to file

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Next is the output of  shntool info  (long form), one file at a time.
-------------------------------------------------------------------------------
file name:                    Sweetheart Rehearsals 1.shn
handled by:                   shn format module
length:                       20:31.42
WAVE format:                  0x0001 (Microsoft PCM)
channels:                     2
bits/sample:                  16
samples/sec:                  44100
average bytes/sec:            176400
rate (calculated):            176400
block align:                  4
header size:                  44 bytes
data size:                    217247184 bytes
chunk size:                   217247220 bytes
total size (chunk size + 8):  217247228 bytes
actual file size:             92327885
file is compressed:           yes
compression ratio:            0.4250
CD-quality properties:
  CD quality:                 yes
  cut on sector boundary:     yes
  sector misalignment:        0 bytes
  long enough to be burned:   yes
WAVE properties:
  non-canonical header:       no
  extra RIFF chunks:          no
Possible problems:
  file contains ID3v2 tag:    no
  data chunk block-aligned:   yes
  inconsistent header:        no
  file probably truncated:    unknown
  junk appended to file:      unknown
  odd data size has pad byte: n/a
Extra shn-specific info:
  seekable:                   no
-------------------------------------------------------------------------------
file name:                    Sweetheart Rehearsals 2.shn
handled by:                   shn format module
length:                       28:41.11
WAVE format:                  0x0001 (Microsoft PCM)
channels:                     2
bits/sample:                  16
samples/sec:                  44100
average bytes/sec:            176400
rate (calculated):            176400
block align:                  4
header size:                  44 bytes
data size:                    303610272 bytes
chunk size:                   303610308 bytes
total size (chunk size + 8):  303610316 bytes
actual file size:             192652769
file is compressed:           yes
compression ratio:            0.6345
CD-quality properties:
  CD quality:                 yes
  cut on sector boundary:     yes
  sector misalignment:        0 bytes
  long enough to be burned:   yes
WAVE properties:
  non-canonical header:       no
  extra RIFF chunks:          no
Possible problems:
  file contains ID3v2 tag:    no
  data chunk block-aligned:   yes
  inconsistent header:        no
  file probably truncated:    unknown
  junk appended to file:      unknown
  odd data size has pad byte: n/a
Extra shn-specific info:
  seekable:                   no
-------------------------------------------------------------------------------
file name:                    Sweetheart Rehearsals 3 (clock tape).shn
handled by:                   shn format module
length:                       73:59.33
WAVE format:                  0x0001 (Microsoft PCM)
channels:                     2
bits/sample:                  16
samples/sec:                  44100
average bytes/sec:            176400
rate (calculated):            176400
block align:                  4
header size:                  44 bytes
data size:                    783117216 bytes
chunk size:                   783117252 bytes
total size (chunk size + 8):  783117260 bytes
actual file size:             386088813
file is compressed:           yes
compression ratio:            0.4930
CD-quality properties:
  CD quality:                 yes
  cut on sector boundary:     yes
  sector misalignment:        0 bytes
  long enough to be burned:   yes
WAVE properties:
  non-canonical header:       no
  extra RIFF chunks:          no
Possible problems:
  file contains ID3v2 tag:    no
  data chunk block-aligned:   yes
  inconsistent header:        no
  file probably truncated:    unknown
  junk appended to file:      unknown
  odd data size has pad byte: n/a
Extra shn-specific info:
  seekable:                   no