Good luck finding an entire wardrobe of black baby clothes! That sounds expensive; novelty onesies are a lot more pricey than a 3-pack from Target.
It is now widely known that newborn babies can pretty much only see black, white, and red. For this reason, there are a lot of black/white/red toys out there for newborns, and as they get older, you find very brightly colored toys. An infant’s vision does not really “get” to pastels for several months. So, while pastels are considered culturally appropriate for babies, it has nothing to do with their development, and everything to do with our perceptions of what is babyish. There are historical reasons for this.* Bright colors are in fact more what they like. Decorating a baby’s room entirely in black, grey, and red would probably not be any too exciting for the little one, however, and while I would not recommend doing the whole thing in wild patterns either, babies do like to look at pictures of animals and people. (We seem to be programmed to recognize faces and other features, so the simplified drawings you get on baby items are actually quite appropriate, and leaving the entire room without them wouldn’t be much fun. Photographs are a little too complex for babies, so simple drawings are the next best thing to reality.)
So, on to music. We now know that people need to hear simple melodies and rythyms before they become able to appreciate more complex forms. The clapping games and nursery rhymes and simple songs for children are actually exactly what they need, and they need them most from real people (without all the cluttering background stuff or ‘kiddiefying’ on many kids’ CDs). Playing classical music is frequently soothing and melodic enough for them to enjoy. An infant does not need Raffi, though older kids (preschoolers) love him, but she does need to hear simple, repetitive songs with an obvious rythym. Kids generally like a wise variety of music, and there’s no need whatsoever to restrict their fare to Children’s Music, but I don’t think a steady diet of hard rock would be optimal for a baby’s developing brain. Also, most kids like songs they can sing themselves about things they understand: food, families, dinosaurs, animals, plants, and so on, so it wouldn’t be good to restrict their music to songs with incomprehensible adult themes.
*Once upon a time, babies were dressed entirely in white. In the days of handwashing, white was easiest to bleach and maintain, while colors faded, and a wide range of dyes wasn’t available anyway. In the early part of the 20th century, theories about child-rearing reached their height in the emphasis on cleanliness and not-too-much-stimulation. Children’s rooms were thought to be best furnished entirely in white, with perhaps some blue, and few decorations. Easy scrubbing and a clean, light atmosphere was the goal–parlty because we were coming out of generations of dim, dirty, cramped housing. With a few centuries of “babies-belong-in-white” behind us, pastels were the preferred way to bring in decoration, especially when, in the 1930’s, light colors became available for the first time.