 The recording of "Kamar Gelap" was more concentrated in studio, unlike the first album (which recorded at the band members' houses).Some musicians collaborated with Efek Rumah Kaca during recording, such as Ramondo Gascaro on "Laki-Laki Pemalu", Ade Paloh provided backing vocals and Iman Fattah played guitar on "Jangan Bakar Buku".The Smashing Pumpkins, R.E.M.