How literal is this phrase?

Sample examples at http://tinyurl.com/is-it-lit

swan song:

Definitions:

  1. a final performance or effort (especially before retirement)

Examples:

  1. debt of gratitude to Paddy . His impending move to Wales may make this his swan song , but many of us hope not . The following major event was the Register
  2. tirelessly for General Pinochet 's release in what was to prove a truly bizarre political swan song . Political pressures from No 10 and Chile began to tell and Straw was forced
  3. Rome , which reached its apex in the early Cinquecento , effectively offers up a swan song for the " Italian Renaissance " writ large : it is at once an expression
  4. stops being a crusade , then there is no point to politics . In a swan song article just before his retirement from party leadership , Paddy Ashdown wrote this about Tony
  5. door flap for mile after mile . So the trip with Brian had been a swan song for the South Western style 4 - 6 - 0 s and a moment of

Note: Please select the answers below carefully based on the definition which occurs frequently in the examples

Step 2: score of 0-5 for how literal is the use of "song" in the phrase "swan song"
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