Today's variable weather will not deter WeJazzUpfrom performing tonight's gig, the last in the series of four Jazz and Blues concerts sponsored by FOSEL. The band, with pianist Frank Wilkins, will have the first two vocalists of the season, one none other thanWali Ali, whose musical credits in addition to singing include having been the lead guitarist for The Temptations, Eddie Kendricks, Teena Marie, Rick James Patrice Rushen, Marvin Gaye, The Jacksons, Aretha Franklin, The Undisputed Truth and Norman Connors. The second singer is the musically versatile saxophonist Pat Loomis,who helped organize the summer series. His son, Antonio, performed two weeks ago in Library Park with the award-winning Charlie Brown Blues Band, which showcased five Boston Arts Academy music students.

The concerts are free. Bring chairs. Enjoy the sliced watermelon provided by FOSEL. The Jazz and Blues series is funded by a generous donation by the Ann H. Symington Foundation. The park is located on Tremont Street between West Newton Street and Rutland Square. Seating is limited. The music starts at 6:30 PM and ends around 8:00 PM. Restrooms are available inside the library which is open on Tuesday nights. The South End branch is fully handicapped accessible.