А Стравинский, Николай Метнер, Шнитке, Щедрин, Мосолов, Хачатурян и т.д. And all the late romantics, of course: Мусоргский, Римский-Корсаков, Сергей Танеев, Балакирев, Цезарь Кюи. And two curiosities, I highly recommend reading their Wikipedia articles: Николай Обухов и Лев Орнштейн.
Sadly, the russian avant-garde seems to be almost non-existent today. I've searched, but all I find is tradionalists leaning on a style strongly reminiscent of Шостакович and Прокофьев, and not really breaking new ground as these composers were. If someone would recommend something edgy and thus challenge my prejudices against the russian contemporaries, I would highly appreciate it.
There's one exception, though, one of my favorites: Софи́я Губайду́лина. Highly recommended. But she's really old. Hardly counts.
Хороший is the full masculine singular nominative case form of the adjective meaning “good”. It can be used both attributively and predicatively: «хороший фильм» = “a good movie”, «Этот фильм хороший» = “This movie is good”. The neuter and feminine full singular forms are хорошее and хорошая, respectively (we are talking about the nominative case here; for other cases you have to learn the adjectival declension). «Хорошо» can be either an adverb meaning “well” («Он хорошо говорит по-русски» = “He speaks Russian well”) or the short neuter form of the adjective meaning “good”. In modern Russian, short forms of adjectives are only used predicatively. «Эта песня хороша» = “The song is good”, «Это стихотворение хорошо» = “The poem is good”, «Этот пирог хорош» = “The pie is good”. All case, gender and number forms included, the Russian adjective has 13 full forms and 4 short ones (not all adjectives have short forms, though).