Answer:
philosophy and practices of music
Explanation:
The full sentence is "Though the Romans adapted Greek instruments for their own use, they did not adapt Greek philosophy and practices of music with the same enthusiasm. "
The Romans adapted Greek instruments, the same way they did with many other forms of art and mythology.
Some of the instruments they borrowed were tibia, lyra, cithara, luta, organs etc.
However, while Greeks put much of thought and soul into every form of art, including music, Romans didn't consider musical art as a vital point in their everyday life. They did not have musical originality,
They mostly copied from Greek and Etruscan music, with borrowed elements from North African people, peoples of Asia Minor, Celts and Gauls. They did not develop much of their style or any system of writing down the music.