I saw Cuarteta de Nos play live in December.
They put on a great show, with cool video projections, and very high energy. They have been together for so long that their audience runs from 5 year olds to 60 year olds, all bouncing up and down together.
But their sound is basic So-Cal punk/ska. If you close your eyes, it could be Sublime.
Old, familiar, and safe.
I much prefer
La Yegros
Axel Krygier
No Los Soportos
Rosal
Islas de Los Estados
Tonolec
Gotan Project
King Coya
Mi Daras Mil Hijos
Al Fin Solos
Gaby Kerpel
Juana Molina
Tango Crash
Ulises Conti
Kevin Johansen
Terraplen
Soda Stereo
Al Fin Solos
Orquestra Tipica Fernandez Fierro
Tanghetto
Supervielle
and the Zizek electronic/DJ collective
(almost all have myspace pages, where you can check em out and see if you like em)
These are all Buenos Aires bands, most you can see live in various places, and buy CD's at places like Zivals and Notorius, which are probably the two best places to buy music in BsAs. Best selections, knowledgable staff, and listen before you buy.
Both on Callao, near Corrientes.
Record stores-
http://rateyourmusic.com/list/Trick...where_to_buy__record_stores_from_buenos_aires
Lots of great live music here, very accessible and cheap by US standards (that is, local bands are cheap- foreign bands, at big stadiums, are expensive)
I like seeing music at Club Niceto,
http://www.nicetoclub.com/
and Trastienda-
http://www.latrastienda.com/
both a reasonable size to actually see and hear a band.
I saw Cuarteto at El Teatro, on LaCroze, in Collegiales, which is a great old hall, but tends to specialize more in headbanger rock- if you like that sort of thing, its a great place to see bands as well, you can go up on the balcony, if you are an old fart like me, and dont want to risk the mosh pit...