I'll list the instruments i play according to my AMEB level (Australian Music Exams Board). The gradings go from Preliminary, to First Grade, to Eight Grade, and then to teaching and performance grades if necessary.
Singing: Finished 8th Grade, not planning on doing anymore.
Piano: Finished 5th Grade, doing exam for 6th Grade soon.
Trumpet: Finished 3rd Grade, doing exam for 4th Grade like, next week.
I want to do Guitar and Drums at some stage, but not until i finish my Piano and Trumpet.