The most common and most likely answer to this crossword clue is the 9 letter word PLAINSONG
I've seen this crossword clue in Financial Times
P
L
A
I
N
S
O
N
G
More clues leading to the result PLAINSONG
- Something stinking about note in second church melody
- Unattractive boy with grand church music
- Centuries-old notes regarding golf on steppes
- . Notes praising evolution of pangolins
- Frank’s playing German church music
- The air on the prairie is music to the ears
- Obvious issue with middle of religious chant
- Chant a simple ditty
- Worries about left working with grand church music
- Chant to the sound of the prairie?
Buddy explains!

The straight part
We know that "music to the ears" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case music to the ears = plainsong.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PLAINSONG mean?
PLAINSONG noun- A form of monophonic chant in unison using the Gregorian scale, sung in various Christian churches.
- A cantus firmus or theme chosen for contrapuntal treatment; so called because often an actual fragment of plain-song.
- The simple notes of an air, without ornament or variation.
- (by extension) A plain unvarnished statement, without exaggeration.