Question: What is the track whent the vocal percussionist is unknown?
SQL: SELECT "Track" FROM "1-28715942-5" WHERE "Vocal Percussionist" = 'unknown';

Question: Who is the arranger when the vocal percussionist is Alexei Kalveks and Dave Brennan?
SQL: SELECT "Arranger(s)" FROM "1-28715942-5" WHERE "Vocal Percussionist" = 'Alexei Kalveks and Dave Brennan';

Question: What is the original artist when the vocal percussionist is Alexei Kalveks?
SQL: SELECT "Original Artist" FROM "1-28715942-5" WHERE "Vocal Percussionist" = 'Alexei Kalveks';