La Casa del Músico, a Boyle Heights music equipment store that has been in the neighborhood since 1978, is closing its doors at 1900 1st Street for good. Co-owner Noel Jaramillo-Venegas, 43, said the store a block east of Mariachi Plaza will close as early as Saturday, Oct. 7, and no later than Monday, Oct. 9, depending on what stock he and his wife Joanna have left in their storefront by the weekend.