In-plane vibrational frequencies of five condensed aromatics were computed from a five-parameter force field pertaining to stretchings and Keating's bendings. The molecules are: anthracene, phenanthrene, pyrene, chrysene and coronene. The results were compared with previous ones from a five-parameter approximation, which employs Decius' bendings. As far as the agreement between calculated and observed frequencies are concerned the results with Keating's bendings appeared clearly to be the superior ones in all the cases investigated.