Reference of v2 songalias

arguments	description	optional
songname	any song name for fuzzy querying	NO

Return data

return songid only
you could using songinfo to obtain full song information

{
    "status": 0,
    "content": {
        "id": "grievouslady"
    }
}

status	description
0	everything is OK
-1	invalid songname
-2	this song is not recorded in the database
-3	too many records
-233	unknown error occurred