Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
accompany [əˈkʌmpənɪ] vt (escort, go along with) сопровожда́ть (сопроводи́ть*perf) (MUS) аккомпани́ровать (impf) +dat
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: