Blackout the fifth album released by Britney Spears released Oct 30th 2007.

Blackout's track list and song features:

1. "Gimme More"
      Features of this song:
        modern r&b stylings
        electronica influences
        call and answer vocal harmony (Antiphony)
        repetitive melodic phrasing
        a vocal-centric aesthetic
        minor key tonality
        a dynamic female vocalist
        prominent use of synth
        subtle use of strings
        vocal harmonies

2. "Piece of Me"
      Features of this song:
|      electronica influences
       danceable grooves
       a subtle use of vocal harmony
       repetitive melodic phrasing
       a vocal-centric aesthetic
       a clear focus on recording studio production
       minor key tonality
       groove based composition
       a dynamic female vocalist
       prominent use of synth

3. "Radar"  
      Features of this song:
         pop rock qualities
         electronica influences
         a subtle use of vocal harmony
         a twelve-eight time signature
         extensive vamping
         minor key tonality
         synthetic sonority
         use of ambient synths
         prominent percussion
         triple note feel

4. "Break the Ice"
      Features of this song:
         pop rock qualities
         electronica influences
         hip-hop influences
         danceable grooves
         repetitive melodic phrasing
         interweaving vocal harmony
         extensive vamping
         a vocal-centric aesthetic
         a clear focus on recording studio production
         minor key tonality
         groove based composition
         melodic songwriting
         a dynamic female vocalist
         prominent use of synth
         subtle use of strings
         erotic lyrics
         vocal harmonies

5. "Heaven on Earth"
      Features of this song:
         pop rock qualities
         electronica influences
         punk influences
         a subtle use of vocal harmony
         mixed minor & major key tonality
         synthetic sonority
         use of ambient synths
         prominent percussion
         romantic lyrics

6. "Get Naked (I Got a Plan)"
      Features of this song: 
         basic rock song structures
         electronica influences
         hip-hop influences
         danceable grooves
         heavy use of vocal harmonies
         repetitive melodic phrasing
         interweaving vocal harmony
         extensive vamping
         paired vocal harmony
         a vocal-centric aesthetic
         a clear focus on recording studio production
         minor key tonality
         groove based composition
         a dynamic female vocalist
 
7. "Freakshow"
      Features of this song:
         synth rock arranging
         electronica influences
         r & b influences
         a subtle use of vocal harmony
         extensive vamping
         minor key tonality
         synthetic sonority
         use of ambient synths
         prominent percussion

8. "Toy Soldier"
      Features of this song:
         basic rock song structures
         electronica influences
         hip-hop influences
         heavy use of vocal harmonies
         repetitive melodic phrasing
         paired vocal harmony
         a vocal-centric aesthetic
         a clear focus on recording studio production
         heavy  syncopation
         minor key tonality
         groove based composition
         a dynamic female vocalist
         use of techno synths
         prominent synth drums

9. "Hot as Ice"
      Features of this song:
         pop rock qualities
         electronica influences
         r & b influences
         a subtle use of vocal harmony
         extensive vamping
         minor key tonality

  
10. "Ooh Ooh Baby"
        Features of this song:
           basic rock song structures
           electronica influences
           danceable grooves
            mild rhythmic syncopation
            heavy use of vocal harmonies
            repetitive melodic phrasing
            mixed acoustic and electric instrumentation
            paired vocal harmony
            a clear focus on recording studio production
            minor key tonality
            groove based composition
            a dynamic female vocalist
            acoustic rhythm guitars
            prominent synth drums
            a mid-tempo shuffle feel

11. "Perfect Lover"
        Features of this song:
           modern r&b stylings
           electronica influences
           a subtle use of vocal harmony
           minor key tonality
           synthetic sonority
           use of ambient synths
           prominent percussion

12. "Why Should I Be Sad"
        Features of this song:
           modern r&b stylings
           electronica influences
           a subtle use of vocal counterpoint
           a subtle use of vocal harmony
           extensive vamping
           use of a string ensemble
           a vocal-centric aesthetic
           a clear focus on recording studio production
           groove based composition
           mixed minor & major key tonality
           a dynamic female vocalist
           prominent percussion

By far my favorite album from Britney Spears.  I especially like Gimme More and Pieces of Me.