for tin cans, muted gongs, audio frequency oscillators, variable speed turntables with frequency recordings and recordings of generator whines, amplified coil of wire, amplified marimbula (a Caribbean instrument similar to the African thumb piano), and electric buzzer
All of the Imaginary Landscape pieces include instruments or other elements requiring electricity. Although all five of the Imaginary Landscape pieces were included in a Mode recording of "Percussion Works I", two of the pieces do not use percussion as such. The booklet included with the aforementioned Mode recording includes a quote from Cage; "It's not a physical landscape. It's a term reserved for the new technologies. It's a landscape in the future. It's as though you used technology to take you off the ground and go like Alice through the looking glass."
The Mode recording includes two versions of No. 4 and No. 5. One version of No. 5 uses period jazz recordings which would have been available to Cage at the time he composed it, and the other version uses recordings of Cage's work. The Mode recording of the Landscapes is No. 43 in their series of CDs of Cage's work, so the previous 42 recordings provide the correct number needed for a realization of No. 5.