Samba is Brazil's national rhythm — the sound of Carnaval, of street parades, of the bateria (the giant samba percussion ensemble that drives a samba school down the avenue). On the drum set, samba is mostly a feet rhythm. The two feet do almost all the work; the hands fill in colour on top.
The two foot voices come from two of the bateria's biggest drums: the surdo, the deep bass drum that marks the downbeat, and the tamborim/agogô, the higher percussion that accents off-beats. On the kit we translate them: kick on every beat 1 (sometimes 1 and 3), hi-hat foot on every "&" — the "and" between every quarter. That two-feet ostinato is samba's heartbeat.
The Surdo + Hi-Hat Ostinato
Said another way: kick on beats 1 and 3 (or just 1, in some styles), hi-hat foot on the &-of-1, &-of-2, &-of-3, &-of-4. Together that's an "8th-note pulse alternating between the feet" — kick on the downbeats, hi-hat on the upbeats. Samba's signature lift comes from the hi-hat foot's steady "tssk · tssk · tssk · tssk" between the kicks.
The Hand Layer
Once the feet are running, the right hand plays a continuous 16th-note pattern on a closed hi-hat or on the floor-tom rim. The left hand plays the telecoteco — samba's characteristic syncopated accent pattern — usually with a cross-stick on the snare. Telecoteco hits land on a few specific places in the bar (the &-of-1, beat 2, &-of-3, &-of-4-ish — there are several common phrasings) and they should feel like the singer's accent on the lyric.
Tempo Note
Samba is fast. Carnaval samba lives at ♩=120–135. Bossa-nova-flavoured samba (the "samba slow") sits closer to ♩=100. We'll start at ♩=100 here so you can feel the foot pattern; once that's locked, push it up to where it actually wants to live.