Here is my song to help pupils learn the declension of the relative pronoun in Latin:

qui quae quod, who, which
quem quam quod, whom, which
cu-i-us means whose, cu-i means to whom or which,
quo qua quo, by with from whom or which.

qui quae quae, who, which
quos quas quae, whom, which
quo-rum, quarum quarum whose,
qui-bus means to whom or which,
qui-bus, by with or from whom or which.

The tune in midi format, which should play easily if your computer has a sound card, is here:

http://blog.arlt.co.uk/qui_quae_quod.midi, or, with slightly more lively accompaniment, here: http://blog.arlt.co.uk/qui_quae_quod2.midi