LEO AND THEODORE by DONALD NEWLOVE 341 pages. Saturday Review Press.
For all its lilting wordplay, the vitality of its episodes, the accessibility of its meaning, sentiments and broad comedy, Donald Newlove's second novel can be quite demanding. After finishing the last page, the reader may feel bound to answer a difficult question: Would he pick up hitchhiking 30-year-old Siamese twins, drenched and not too sober, carrying a trumpet, a trombone, a suitcase, a bag containing laundry and a bust of Ludwig van Beethoven?
Do not laugh-or at least do not laugh in the...