SCHEMA:
CREATE TABLE table_28715942_5 (arranger_s_ VARCHAR, vocal_percussionist VARCHAR)
USER:
Who is the arranger when the vocal percussionist is Alexei Kalveks and Dave Brennan?

QUERY:
SELECT arranger_s_ FROM table_28715942_5 WHERE vocal_percussionist = "Alexei Kalveks and Dave Brennan"