Obtain Swinging Maestro from the Support Card gacha
Pull the SSR Special Week support card that has Swinging Maestro as a skill hint
Use a support card rental/friend support that provides Swinging Maestro
Learn Swinging Maestro from inheritance if a parent or borrowed support passes it down
Trigger event rewards from specific support cards that offer Swinging Maestro as a possible skill hint
Acquire it through limited-time banners or reruns featuring the relevant support card
Check the in-game skill list for the exact card that teaches Swinging Maestro before pulling or borrowing