Create a web service session for a user. Used for authenticating a user when the password can be inputted by the user. Accepts email address as well, so please use the username supplied in the output. Only suitable for standalone mobile devices. See the authentication how-to for more. You must use HTTPS and POST in order to use this method.
password (Required) : The password in plain text. username (Required) : The last.fm username or email address. api_key (Required) : A Last.fm API key. api_sig (Required) : A Last.fm method signature. See authentication for more information.