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Initial AVL tree: 
Number of artists:    19
Height:                5

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Command: display
         Allman Brothers Band\
            B. B. King-
      Clapton, Eric-
            Crosby, David-
         Crosby, Stills and Nash/
   Derek and the Dominos-
         Dire Straits-
      Harrison, George\
         Howlin' Wolf\
            Jethro Tull-
Keb' Mo'-
            Knopfler, Mark-
         Led Zeppelin/
      Morrison, Van/
         Pink Floyd-
   Seeger, Bob/
         The Band-
      The Chieftans-
         Yes-
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Command: artist	Clapton, Eric
   'Clapton, Eric' found at level 2
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Command: artist	Jethro Tull
   'Jethro Tull' found at level 4
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Command: artist	Knopfler, Mark
   'Knopfler, Mark' found at level 4
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Command: list	Clapton, Eric
Clapton, Eric
Recordings:
     CD  1988    Crossroads
     CD  1994    From the Cradle
     CD  2000    Riding with the King
     LP  1991    24 Nights
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Command: list	B. B. King
B. B. King
Recordings:
     CD  2000    Riding with the King
     CD  1998    Blues on the Bayou
     CD  1997    Deuces Wild
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Command: list	Allman Brothers Band
Allman Brothers Band
Recordings:
     CD  1992    The Fillmore Concerts
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Command: artist	Greatful Dead
   'Greatful Dead' not found
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Command: list	Rolling Stones
   'Rolling Stones' not found
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Command: title	From the Cradle
    1994    Clapton, Eric
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Command: title	Riding with the King
    2000    B. B. King
    2000    Clapton, Eric
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Command: title	Behind the Sun
    'Behind the Sun' not found
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Command: remove	Seeger, Bob
Removed: 
Seeger, Bob
Recordings:
     CD  1994    Greatest Hits
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Command: display
         Allman Brothers Band\
            B. B. King-
      Clapton, Eric-
            Crosby, David-
         Crosby, Stills and Nash/
   Derek and the Dominos-
         Dire Straits-
      Harrison, George\
         Howlin' Wolf\
            Jethro Tull-
Keb' Mo'-
            Knopfler, Mark-
         Led Zeppelin/
      Morrison, Van/
         Pink Floyd-
   The Band/
      The Chieftans\
         Yes-
=================================================
Command: remove	Dire Straits
Removed: 
Dire Straits
Recordings:
     LP  1978    Dire Straits
     LP  1985    Brothers in Arms
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Command: display
         Allman Brothers Band\
            B. B. King-
      Clapton, Eric-
            Crosby, David-
         Crosby, Stills and Nash/
   Derek and the Dominos/
         Harrison, George-
      Howlin' Wolf-
         Jethro Tull-
Keb' Mo'-
            Knopfler, Mark-
         Led Zeppelin/
      Morrison, Van/
         Pink Floyd-
   The Band/
      The Chieftans\
         Yes-
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Command: remove	Pink Floyd
Removed: 
Pink Floyd
Recordings:
     LP  1973    Dark Side of the Moon
     LP  1979    The Wall
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Command: display
         Allman Brothers Band\
            B. B. King-
      Clapton, Eric-
            Crosby, David-
         Crosby, Stills and Nash/
   Derek and the Dominos/
         Harrison, George-
      Howlin' Wolf-
         Jethro Tull-
Keb' Mo'/
         Knopfler, Mark-
      Led Zeppelin-
         Morrison, Van-
   The Band-
      The Chieftans\
         Yes-
=================================================
Command: remove	Howlin' Wolf
Removed: 
Howlin' Wolf
Recordings:
     CD  1989    The London Sessions
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Command: display
         Allman Brothers Band\
            B. B. King-
      Clapton, Eric-
            Crosby, David-
         Crosby, Stills and Nash/
   Derek and the Dominos/
         Harrison, George-
      Jethro Tull/
Keb' Mo'/
         Knopfler, Mark-
      Led Zeppelin-
         Morrison, Van-
   The Band-
      The Chieftans\
         Yes-
=================================================
Command: remove	Jethro Tull
Removed: 
Jethro Tull
Recordings:
     LP  1972    Thick as a Brick
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Command: display
      Allman Brothers Band\
         B. B. King-
   Clapton, Eric\
            Crosby, David-
         Crosby, Stills and Nash/
      Derek and the Dominos/
         Harrison, George-
Keb' Mo'/
         Knopfler, Mark-
      Led Zeppelin-
         Morrison, Van-
   The Band-
      The Chieftans\
         Yes-
=================================================
Command: remove	Allman Brothers Band
Removed: 
Allman Brothers Band
Recordings:
     CD  1992    The Fillmore Concerts
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Command: display
         B. B. King-
      Clapton, Eric-
         Crosby, David-
   Crosby, Stills and Nash-
      Derek and the Dominos\
         Harrison, George-
Keb' Mo'-
         Knopfler, Mark-
      Led Zeppelin-
         Morrison, Van-
   The Band-
      The Chieftans\
         Yes-
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Command: exit