At one bar, it's an acoustic samba de roda group with drums and cavaquinho, a steel-stringed ukelele-sized instrument.
At another club, there's a lively band with a horn section doing samba gafieira, the swinging brass version of the music that fuels couples dancing.
At another, you might hear choro, a guitar-based precursor of samba.
Lapa is the historic cultural heart of Rio, where bohemians and artists have gathered through the decades.
Rio Scenarium is a nightclub in an antiques store.
It was once called the Montmartre of Rio, after the artist quarter in Paris.
By the 1970s it had become a seedy, derelict zone to avoid.
But as has happened in so many cities, redevelopment revitalized it into a nightlife hub.
Many of the old mansions in the area, home to Rio's wealthy until the arrival of the 20th century, have been restored and now house bars, cafes and clubs.
The sidewalks of Lapa are buzzing most nights until the early hours, with musical options ranging from the traditional -- samba, choro, forro -- to Musica Popular Brasileira (MPB), a signature Brazilian take on modern pop and rock that's produced great artists such as Caetano Veloso and Milton Nascimento.
Even if it weren't a hive of music and partying, Lapa would be worth a visit.
The double decker Roman-style aqueduct, Arcos da Lapa, hearkens to the 1700s, when Rio drew its water from the hills above.
The 19th-century mansions, dressed up in a variety of colorful pastels, look like they were beamed in from old Lisbon.
Lapa feels more like Portugal than the modern Brazil of Copacabana and Ipanema.
Top music venues include Rio Scenarium and Carioca da Gema, where the best known samba artists perform regularly.
Samba grew out of a fusion of African drum circles and European marches and choro.
There are many styles of samba, and you can catch a lot of them in Lapa.
Samba chronicles the struggles of life and love, and conquers them through the joy of the music.
It allows participants to jiu-jitsu a bad day at the drop of a cavaquinho, the hyper ukulele-like instrument that revs samba.
Tops spots for music
Here's where to feel the pulse of Rio:
Cafe Cultural Sacrilegio
Located in a renovated mansion that was once home to composer Joao Pernambuco, an associate of Brazilian musical icons Villa Lobos and Pixinguinha, and where Carmen Miranda learned the millinery trade, Cafe Cultural Sacrilegio features a great lineup of samba de roda, pagode, and choro artists on its main stage.
Eclectic and artistic, it lives up to the bohemian vibe of Lapa's roots.
On Fridays and Saturdays after the last live performance, there's modern dance music from deejays deep into the morning hours.