Always wanted to tango?  Now's your chance.   A new session of six Argentine tango classes is starting soon.  Sunday session starts Jan. 9, Tuesday session starts Jan. 11.  Novices, singles or couples welcome.   See http://www.pittsburghtangueros.org/classes.html for details.   Private lessons are also available in Highland Park if you want to progress faster or need a more flexible schedule.   Call Jerry at 412-661-2480.