The AKG C567 E1 Microphone is an inconspicuous, matte black, omnidirectional miniature microphone. Has a 3.5m connecting cord.  

Its wide frequency range makes it a very good instrument microphone too. May be installed inside a guitar sound hole; also suited for violin and zither. To mic up a grand piano, tape two c 567’s to the lid, which may then be closed for higher gain-before-feedback.