Raj gaanE gaata hai. = Raj sings songS....Raj gaanA gaata hai = Raj sings a song.
who will be my friend here I am pahal
Raj sings songs should be the correct answer
That would be राज गाने गाता है
That must have been Raj sings song because in the hindi sentence any singular matter is not mentioned
But in English, "Raj sings song" is not a correct sentence, you must add an article, a/an/the. Articles don't exist in Hindi, so this is the closest translation.
Is गीत/गीता (geet/geeta) also an acceptable way to say "song"? I've heard this word mostly in Sanskrit sources (Bhagavad-Gita, Gita-Govinda, etc.), but I'm not sure if it's used in modern Hindi.
That must be raj ganna gata hai because its not told whether that how many songs he sings that's wrong correct it