In 1999 Sigur Rós released 'Ágætis Byrjun' ('A Good Start'), which Q magazine deemed 'the last great record of the 20th century'. By the end of the year, it had won the inaugural US Shortlist Prize for Artistic Achievement in Music. This 20th Anniversary edition of the album features demo and archive versions of the songs, plus never-before-heard newly-unearthed material from the time, rare b-sides and the full 95-minute concert played in Reykjavík on the day the record was released.

Disc: 1
1. Intro
2. Svefn-g-englar
3. Staralfur
4. Flugufrelsarinn
5. Ny batteri
6. Hjartað hamast (bamm bamm bamm)
7. Viðrar vel til loftarasa
8. Olsen olsen
9. Ágaetis byrjun
10. Avalon

Disc: 2
1. Untitled #1 (Vaka)
2. Von (Live at Íslenska Óperan, 1999)
3. Syndir guðs (Live at Íslenska Óperan, 1999)
4. Flugufrelsarinn (Live at Íslenska Óperan, 1999)
5. Olsen olsen (Live at Íslenska Óperan, 1999)
6. Agaetis byrjun (Live at Íslenska Óperan, 1999)
7. Viðrar vel til loftarasa (Live at Íslenska Óperan, 1999)
8. Svefn-g-englar (Live at Íslenska Óperan, 1999)

Disc: 3
1. Ny batteri (Live at Íslenska Óperan, 1999)
2. Nyja lagið (Live at Íslenska Óperan, 1999)
3. Hafsol (Live at Íslenska Óperan, 1999)
4. Hugmynd 1 (1998 Demo)
5. Hugmynd 2 (1998 Demo)
6. Hugmynd 3 (1998 Demo)
7. Debata mandire (Live at Laugardasholl, 1999)
8. Rafmagnið buið

Disc: 4
1. Svefn-g-englar (Live at Popp i Reykjavik, 1998)
2. Staralfur (Original Speed Version)
3. Flugufrelsarinn (1998 Demo)
4. Ny Batteri (First Mix)
5. Hjartað hamast (1995 Demo)
6. Viðrar vel til loftarasa (Alternative Ending)
7. Olsen olsen (1998 Demo)
8. Ágætis byrjun (1998 Demo)