Beats (Drums) and Duffs are
haraam!
Many people say they are halaal. Heres what Aimmah say
Imam Jafer Sadiq

has said,"
I prohibit for you dancing and playing flute, drums and tabla."
(Al Kafi)
The imam also says,
"If drums and cymbals are played at one's house for forty days, Allah will impose a satan by the name of 'FAQANDIR'. The satan will infiltrate into every cell of the person's body. With the spread of this evil, the person loses all sense of dignity and self esteem. he will then not care as to what he says or what is said about him. Then, this satan blows into this person. As a result,he becomes utterly shameless. So much that he is not concerned or affected even if his women are dishonoured."
(Wasaelush Shia)
Imam Ali

has said,
" Angels do not even enter a house that has wine, drum, tambourine or a flute.Even the prayers of the inhabitants of this house are unacceptable. They are deprived of barakat."
(Wasaelush Shia)
Imam Ridha

says,
" A person invites divine wrath when in his house instruments like flute, drum and chess are played for forty days. If this man dies within these forty days, his daeth would be of a sinner and a transgressor. His place shall be in hell and what a dreadful place that is."
(Mustanad al Taraqi)
Another tradition states ,
" And you shall see that music will be so prevalant that no one will dissuade others nor will he find in himself the need to do so. And you shall see that music would be openly played even in the two sanctuaries.( Makkah and Madinah)"
(Mustanad naraqi)