The Collaborative International Dictionary of English v.0.48:

Lyric \Lyr"ic\, Lyrical \Lyr"ic*al\, a. [L. lyricus, Gr. ?: cf.
   F. lyrique. See Lyre.]
   1. Of or pertaining to a lyre or harp.
      [1913 Webster]

   2. Fitted to be sung to the lyre; hence, also, appropriate
      for song; suitable for or suggestive of singing; -- of
      music or poetry.
      [1913 Webster]

   3. expressing deep personal emotion; -- said especially of
      poetry which expresses the individual emotions of the
      poet; as, the dancer's lyrical performance. "Sweet lyric
      song." --Milton.

   Syn: lyric.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

lyrical
    adj 1: suitable for or suggestive of singing
    2: expressing deep emotion; "the dancer's lyrical performance"
       [syn: lyric, lyrical]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "lyrical":
   Alcaic, Anacreontic, Castalian, Homeric, Hudibrastic, Pierian,
   Pindaric, Theocritean, achingly sweet, agreeable,
   agreeable-sounding, alto, appealing, ariose, arioso, bardic,
   baritone, bass, bravura, bucolic, canorous, cantabile, catchy,
   choral, choric, coloratura, didactic, dithyrambic, dramatic,
   dulcet, ebullient, eclogic, ecstatic, effusive, elegiac, emotional,
   encomiastic, enthusiastic, epic, euphonic, euphonious, euphonous,
   exuberant, falsetto, fine-toned, golden, golden-tongued,
   golden-voiced, heroic, honeyed, hymnal, idyllic, impassioned,
   liturgical, lyric, melic, mellifluent, mellifluous, mellisonant,
   mellow, melodic, melodious, mock-heroic, music-flowing, music-like,
   musical, narrative, operatic, panegyrical, pastoral, pleasant,
   pleasant-sounding, poetic, poetico-mystical, poetico-mythological,
   poetico-philosophic, poetlike, psalmic, psalmodial, psalmodic,
   rapturous, rhapsodic, rich, runic, sacred, sapphic, silver-toned,
   silver-tongued, silver-voiced, silvery, singable, singing, skaldic,
   songful, songlike, sonorous, soprano, sweet, sweet-flowing,
   sweet-sounding, tenor, treble, tunable, tuneful, vocal