What grade level? Pick fun songs – variations on popular songs. Pick simple Gospel or folk songs which have a very simple structure, then perform the song multiple times with changes. Here are some ideas: first time – straight thru with piano / recorded accompaniment. second time – a capella with echos. third time – a capella with hand clapping on beats 2 and 4. fourth time – with accompaniment, sing melody on “la”. Slow / speed up / pause at certain measures to add suspense and interest.