Clusters of methane are isolated in solid parahydrogen. The vibrational spectral region of the nu(4) fundamental of methane molecule is surveyed with a Fourier transform infrared spectrometer and a high-resolution difference-frequency infrared laser system. More than 200 sharp absorption lines are discovered whose linewidth is as narrow as 0.007 cm(-1) (200 MHz). The spectrum indicates that the rovibrational levels of the clusters of small sizes are well quantized in solid parahydrogen. (C) 1997 American Institute of Physics.