[Khronos]

Hola, no te molestastes en buscar nada... pero claro lo más fácil es preguntar
En google salen miles de páginas que te dicen como hacerlo....

Un ejemplo es este:

Código Delphi [-]
type 
  TID3Tag = record
    ID: string[3];
    Titel: string[30];
    Artist: string[30];
    Album: string[30];
    Year: string[4];
    Comment: string[30];
    Genre: Byte;
  end;

const
 Genres : array[0..146] of string =
    ('Blues','Classic Rock','Country','Dance','Disco','Funk','Grunge',
    'Hip- Hop','Jazz','Metal','New Age','Oldies','Other','Pop','R&B',
    'Rap','Reggae','Rock','Techno','Industrial','Alternative','Ska',
    'Death Metal','Pranks','Soundtrack','Euro-Techno','Ambient',
    'Trip-Hop','Vocal','Jazz+Funk','Fusion','Trance','Classical',
    'Instrumental','Acid','House','Game','Sound Clip','Gospel','Noise',
    'Alternative Rock','Bass','Punk','Space','Meditative','Instrumental Pop',
    'Instrumental Rock','Ethnic','Gothic','Darkwave','Techno-Industrial','Electronic',
    'Pop-Folk','Eurodance','Dream','Southern Rock','Comedy','Cult','Gangsta',
    'Top 40','Christian Rap','Pop/Funk','Jungle','Native US','Cabaret','New Wave',
    'Psychadelic','Rave','Showtunes','Trailer','Lo-Fi','Tribal','Acid Punk',
    'Acid Jazz','Polka','Retro','Musical','Rock & Roll','Hard Rock','Folk',
    'Folk-Rock','National Folk','Swing','Fast Fusion','Bebob','Latin','Revival',
    'Celtic','Bluegrass','Avantgarde','Gothic Rock','Progressive Rock',
    'Psychedelic Rock','Symphonic Rock','Slow Rock','Big Band','Chorus',
    'Easy Listening','Acoustic','Humour','Speech','Chanson','Opera',
    'Chamber Music','Sonata','Symphony','Booty Bass','Primus','Porn Groove',
    'Satire','Slow Jam','Club','Tango','Samba','Folklore','Ballad',
    'Power Ballad','Rhytmic Soul','Freestyle','Duet','Punk Rock','Drum Solo',
    'Acapella','Euro-House','Dance Hall','Goa','Drum & Bass','Club-House',
    'Hardcore','Terror','Indie','BritPop','Negerpunk','Polsk Punk','Beat',
    'Christian Gangsta','Heavy Metal','Black Metal','Crossover','ContemporaryC',
    'Christian Rock','Merengue','Salsa','Thrash Metal','Anime','JPop','SynthPop');

function readID3Tag(FileName: string): TID3Tag; 
var 
  FS: TFileStream; 
  Buffer: array [1..128] of Char; 
begin 
  FS := TFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite); 
  try 
    FS.Seek(-128, soFromEnd); 
    FS.Read(Buffer, 128); 
    with Result do  
    begin 
      ID      := Copy(Buffer, 1, 3); 
      Titel   := Copy(Buffer, 4, 30); 
      Artist  := Copy(Buffer, 34, 30); 
      Album   := Copy(Buffer, 64, 30); 
      Year    := Copy(Buffer, 94, 4); 
      Comment := Copy(Buffer, 98, 30); 
      Genre   := Ord(Buffer[128]); 
    end; 
  finally
    FS.Free; 
  end; 
end;

Para editar la información tienes que hacer el proceso inverso, pero eso ya te lo dejo a ti.

Salu2