Yes, you can stream music in the Deezer app whilst roaming. Please remember that use of your mobile phone while roaming will incur roaming charges, this includes music streaming that uses mobile data. Another option is to download the songs before you go off island so that you will not need to use a mobile network to listen to music. Also, it is advised to set your account to only download music via Wi-Fi by turning off the cellular setting in the Deezer app.