To protect their sanity, the Mane Five eventually tell Pinkie that she is not good at the instrument and should perhaps spend her time on something she is naturally better at.
Official Season 8 Episode 18 Discussion Thread... The Encore! [S8E18] Yakity-Sax
At a performance in Yakyakistan, the yaks reveal that the instrument is about the joy of playing , not technical perfection. Pinkie resumes playing with her friends' full support. Key Themes & Trivia To protect their sanity, the Mane Five eventually
After picking up the yovidaphone, Pinkie Pie practices incessantly. However, her playing is so loud and tuneless that it causes physical discomfort to those around her, even turning Rarity’s apples into applesauce. At a performance in Yakyakistan, the yaks reveal
Devastated by the critique, Pinkie gives up the instrument and falls into a deep depression, losing her color and reverting to her somber "Pinkamena" state.