In contrast to what, historically, has been normal for the end of April, municipal performance ended the month on a very positive note. The Barclays Capital Municipal Bond Index1 was ahead by 1.15%2 and the Barclays Capital High Yield Municipal Bond Index1 nearly doubled that at 2.23%2...Cash flow from maturities and called bonds, according to street source Siebert Brandford Shank & Co., is estimated to be higher this May by nearly $3 billion over last year. Average monthly reinvestment into municipal bonds in 2011 was $22 billion, but it is already $1 billion higher in 2012.