The ornamental design for a musical instrumentslide with aperture, as shown and described.
FIG. 1 is a perspective view of a musical instrument slide with aperture embodying the design.
FIG. 2 is a front elevational view thereof, the rear elevational view being the mirror image thereof.
FIG. 3 is a right side elevational view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is cross-sectional view along the line 7-7 of FIG. 6; the broken lines indicate the presence of a liquid within the musical instrument slide with aperture.