Google Scholar is a great way to search for academic articles across multiple disciplines. Change the preferences on your Google Scholar page to link to Foley Library's full-text holdings.
Use a site: search to search a particular website. For example, searching site:www.philorch.org cello will only return results containing cello from the Philadelphia Orchestra's website. More broadly, you can search an entire domain. For example, searching site:.org orchestra will only return results containing orchestra from .org websites.