HE SEEDS OF SINGING will undoubtedly end up in that same section, under "romantic novels," but it probably won't appeal to the readers who will be beguiled by Sisterhood, nor to anyone who has sworn never again to open a book containing the phrase "he smothered her with kisses." The setting is the Dutch East Indies, before, during, and after World War II. The graphically described violence can hardly be called gratuitous, since the mores of the headhunters in Borneo pale by comparison to the activities of the "civilized" Japanese troops. Against this bloody background a traditional, basically old-fashioned love story is played out. The lovers are kept apart by wicked relatives, social convention, and, when all else fails, World War II. Catherine and Michael are types familiar to all "romance" readers--they are both divinely beautiful, impossibly intelligent (both have PhD's in anthropology) and painfully noble. As in most books of this popular variety, the background is painstakingly researched and convincingly described; in fact, the most interesting characters are the aborigines--members of the Dani clans of Dutch New Guinea, whose culture remained relatively untouched by modern life until the 1940s. The descriptions of the Philippine and other Pacific campaigns will interest readers who are too young to remember that war. Dell is making this its number one book for February, and it will probably do quite well. Some readers may even sob aloud at the ending, as Susan Moldow, Dell's editor in chief, claims she did, but I have to admit I remained dry-eyed and calm.