This is the 1160th most frequent French word.
musical
Pertaining to music; melodic or harmonious.
The word 'musical' is used here as an adjective to describe 'groupes' (groups), meaning bands associated with music.
J'aime écouter des groupes musicaux pendant mon temps libre.
I like listening to musical bands during my free time.
In this sentence, 'musical' qualifies 'spectacle' (show), indicating that it involved music or was related to music performances.
Le spectacle musical hier soir était incroyable.
The musical show last night was incredible.
Here, 'musicale' is used to describe 'formation' (training), suggesting that it deals with learning or practicing music.