The potential harm to your digital security is a high price to pay for a single song.
Besides direct downloads, you could try searching for the song on YouTube. Many songs, including "Salma Pe Dil Aa Gaya," are available there, and you can use a YouTube to MP3 converter if you wish to download it. However, be aware of the legality and safety of such converters. salma pe dil aa gaya mp3 song download pagalworld