In this work the Dutch composer Marc van Delft attempts to bring together two parties (former friends), after they have grown inexplicably apart. For this reason he calls in the help (Invocation) from the medium of music.
 

At first, 'Invocation' radiates a sense of serene calme, from which the composer gradually creates an atmosphere resembling a conversation.

Half-way there is an increase of suspense, ending once again in calm.
 

The listener remains uncertain, however, regarding the finish