--many of these so-called people who sing and dance for Islam like Yusuf Islam and Sami Yusuf and this Native deen are sufis themselves, you should beware of them because many of them include music while singing etc. also You should stick to more benificial things then downloading useless things like what these people do,
" thought just because their nasheeds do increase my imaan and taqwa, then it will be ok to listen "
-- I disagree with you, most of time these nasheeds are more harmful for Muslims because there are muslims out there who only listen to them singing and thats all they listen to, they don't listen to the Qur'an or study Islam, and all they do is indulgde themselves in these "nasheeds" which these people make and thats all the Islam they know. they don't even know how to pray properly or even fundamentals of Islam but they busy themselves with listening to these useless things. It's like a drug, you listen to country music one day, and you get used to listening to music, then next day you listen pop music, then afterwards you turn to Metallica, that is how shaytan works with you, he puts sugar and beautifies these things just like how these singers are doing, until you leave all together Islam.