‘이프(If)’의 세 번째 싱글 [옛날 노래] 발매 “Old Song” [Credits] 1. 옛날 노래 Composed by 노는어린이(E.T), 멜로디공작소(E.T) Lyrics by 노는어린이(E.T), 멜로디공작소(E.T) Arranged by 노는어린이(E.T), 멜로디공작소(E.T) Piano Performed by 김예슬 Guitar Performed by 정수완 Bass Performed by 임기범 String Performed by 김원현 Background Vocal by 이윤진 Recorded by Xx @ C& Studio Mixed by Xx @ X Sound Lab Mastered by 권남우 @ 821 Sound Mastering 2. 옛날 노래 (Inst.) Composed by 노는어린이(E.T), 멜로디공작소(E.T) Arranged by 노는어린이(E.T), 멜로디공작소(E.T) Piano Performed by 김예슬 Guitar Performed by 정수완 Bass Performed by 임기범 String Performed by 김원현 Recorded by Xx @ C& Studio Mixed by Xx @ X Sound Lab Mastered by 권남우 @ 821 Sound Mastering Executive Producer: C& Co.,Ltd. / E.T Produced by E.T Promotion & Artist Management Director Mr.윤 A&R 전현경 @ C& Co.,Ltd. / E.T