Lesti's Indonesian pop recording "Purnama" was first conceived in 2015, but the artist waited three years to release it. The composition underwent three arrangement changes before its release. Lesti's vocal performance on "Purnama" explores a greater range than previous work, demanding a strong lower octave and concluding with a high, almost shouted note. The artist noted that early recordings of the song featured her "raw" voice, leading to re-arrangements that showcase a more mature vocal delivery.