[SQL] SQL funtion

[Najm Hashmi]

Hi All,
 I have written a very simply function as follows:
create function song_info(int4) returns setof songs as'
   select songs.* from songs
   where $1=song_id'
   language 'sql';
when iIcall it  I get the following:    flipr=# select song_info(4);
                             ?column?
                                -----------
                             136428992
                                (1 row)

Is not it suppose to retrun me the tuple form songs table rather than
oid....
If  I want to get a complete tuple what can I do.
Thank you all for your help.
Regards, Najm.