The modern version alternative music--actually an offshoot with roots from the British rock subgenre.
NOTE: Garage rock has changed in the last 40 years. The feel is more fast pased, and it usually gives a "complete" feeling; there are usually no boring gaps or holes in the song. Garage rock shares some qualities with Indie, such as their individuality. Also, these bands are often the lesser known bands, which has no correlation with their talent.
Contrary to emo, pop, metal, punk, goth, "modern" or "anthem" rock, etc...
Garage Rock bands include:Black Rebel Motorcycle Club (BRMC), The Hives, The Vines, The Stooges, Sahara Hotnights, The Subways, Caesars, The Libertines, The White Stripes (borders general rock), Yeah Yeah Yeahs, Donnas, Cardigans (borders on pop).
NOTE: This list is only a fraction of accomplished bands. Bands form and die everyday, and some are never known out of their hometown.