Translation:I enjoyed the music at the party last night.
I answered "I enjoyed the party music last night." (X) You used the wrong word. I enjoyed the music at the do last night. ("at the do" underlined.) I get the use of "music at the party" vs "party music" distinction. But I don't understand the correction. Particularly the "at the do". Reported 20.7.2018
The corrections are occasionally less than helpful. That part of the course needs to be fixed.
"i enjoyed the party music last night" should also be accepted. reported