Tango, declared cultural heritage of Buenos Aires in 1998 and intangible cultural heritage of humanity by the UNESCO in 2009, is probably the only cultural manifestation throughout history that embodies music, dance, and poetry. This encyclopedia gives a detailed account of tango recordings before, during, and after the golden age of tango, along with tango orchestras, musicians, and singers.
A bit more about the orchestra leaders, musicians, and singers would make this book even better! Great resource to research which version of tango, i. e. what year you're listening to. Also, nice to know who the singer is and which label the original came off of.