### Explanation

                              a is 1st cmdline arg; XL is [a-z]; z is lowercase alphabet
a@\(\w+.|.     List of all matches in a of this regex:
Either a ( followed by letters followed by another
character (i.e. the closing paren), or any one character
@XL  For each of those matches, a list of all matches of this
regex (effectively, split the match into a list of
characters and keep only the lowercase letters)
z@?                 Find index of each letter in the lowercase alphabet
M                    To that list of lists of indices, map this function:
'.X7                           Take a string of 7 periods
RA_                        and replace the characters at all indices in the argument
'O                      with O
Finally, autoprint the resulting list, with each item on
its own line (-l flag)


Uses regex to analyze the music intoHere's a list of listssample of indices, which are then converted to the music box design and printed as lines with -l. Further explanation pending.how an input is transformed:

"b.(ceg)"
["b" "." "(ceg)"]
[["b"] [] ["c" "e" "g"]]
[[1] [] [2 4 6]]
[".O....." "......." "..O.O.O"]


Uses regex to analyze the music into a list of lists of indices, which are then converted to the music box design and printed as lines with -l. Further explanation pending.

### Explanation

                              a is 1st cmdline arg; XL is [a-z]; z is lowercase alphabet
a@\(\w+.|.     List of all matches in a of this regex:
Either a ( followed by letters followed by another
character (i.e. the closing paren), or any one character
@XL  For each of those matches, a list of all matches of this
regex (effectively, split the match into a list of
characters and keep only the lowercase letters)
z@?                 Find index of each letter in the lowercase alphabet
M                    To that list of lists of indices, map this function:
'.X7                           Take a string of 7 periods
RA_                        and replace the characters at all indices in the argument
'O                      with O
Finally, autoprint the resulting list, with each item on
its own line (-l flag)


Here's a sample of how an input is transformed:

"b.(ceg)"
["b" "." "(ceg)"]
[["b"] [] ["c" "e" "g"]]
[[1] [] [2 4 6]]
[".O....." "......." "..O.O.O"]

1

# Pip, 29 bytes

28 bytes of code, +1 for -l flag.

'.X7RA_'OMz@?a@\(\w+.|.@XL


Takes input in lowercase as a command-line argument. Try it online!

Uses regex to analyze the music into a list of lists of indices, which are then converted to the music box design and printed as lines with -l. Further explanation pending.