Answer
1. It is not permissible to celebrate April Fools day.
2. Music is expressly prohibited in many Ahaadith. Among the dominant
purposes of our beloved Prophet (Sallallaahu Alayhi Wasallam) was to destroy
musical instruments. (Mishkat vol.2). Music:
http://www.jamiat.org.za/v41ifta.html
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai
FATWA DEPT.