From being like a stone in the grass to rocking the Garden

from Jean Grae (Ft. Pharoahe Monch & Royce Da 5'9") – Assassins Lyrics on Rap Genius

Meaning

Royce finds it ironic that he began as a “stone in the grass” (insignificant), to performing (“rocking” — note the play off “stone”) at Madison Square Garden, a famous concert venue

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