Just go2 www.islamicwaves.blogspot.com and see the nasheeds,or search in youtube,and if you want to download go to www.clipnabber.com or www.savevid.com or www.keepvid.com and copy the url of that nasheed and paste them in those sites to download,it will get downloaded in flv format,you need to have VLC player to play those files
Hope you find them and able to download those nasheeds easily by using those websites,you can convert the format of videos by using video converters thats it